Which of the following is not considered a carcinogen?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019

Pathology & Genetics

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019

Explanation

Genes are the fundamental units of heredity that carry the instructions for building and maintaining an organism.
While mutations in specific genes, such as oncogenes and tumor suppressor genes, are the underlying cause of cancer, the genes themselves are not the external agents that induce this transformation.
Carcinogens are the agents (chemical, physical, or biological) that cause damage to DNA, leading to the gene mutations that can result in cancer.
Therefore, genes are the target of carcinogens, not carcinogens themselves.

Option A: Tobacco smoke contains dozens of chemical carcinogens, including polycyclic aromatic hydrocarbons and nitrosamines, making it a leading cause of preventable cancer.
Option B: Ultraviolet (UV) radiation from the sun is a well-established physical carcinogen. It directly damages DNA in skin cells, causing mutations that can lead to basal cell carcinoma, squamous cell carcinoma, and melanoma.
Option C: Certain viruses, known as oncoviruses, are classified as biological carcinogens. They can cause cancer by integrating their genetic material into a host cell's DNA or by causing chronic inflammation. Examples include HPV, EBV, and HBV.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification and identification of carcinogens as background academic context rather than a clinical decision trigger.
Nurses have a vital role in primary cancer prevention through patient education about avoiding known carcinogens.
Key nursing interventions include counseling on smoking cessation, advising on sun protection measures (e.g., sunscreen, protective clothing), and promoting vaccinations for oncogenic viruses like HPV and Hepatitis B.
Understanding the different types of carcinogens helps nurses provide targeted health promotion and risk-reduction strategies to diverse patient populations.

How to Approach the Question

First, identify the negative framing of the question with the word 'not'. This means you are looking for the one option that does not fit the category.
Define the key term: A 'carcinogen' is an agent that causes cancer.
Systematically evaluate each option against this definition.
Consider Tobacco: It's widely known to contain chemicals that cause cancer. It is a source of carcinogens.
Consider Ultraviolet Rays: Sun exposure is a known cause of skin cancer. It is a carcinogen.
Consider Viruses: Certain viruses like HPV are known to cause cancer. They are carcinogens.

Concept Tested & Keywords

Concept Tested: Classification and identification of carcinogens
Stem keywords: carcinogen
Lead-in keywords: not
Negative lead-in flag: Question asks to identify the option that is NOT a carcinogen.

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 330-332

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