Chhaya oral contraceptive pills (OCP) is:

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E6 Pharmacology KD Tripathi Essentials 9e Part 1 p. 375-377
Practise the full Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)
Attempt every question from this paper in a timed mock, then review the full solution for each one.