A condition that causes thin, concave nails, raised at edges, looking like a spoon is called?

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1953-1955
E6 Medicine Davidson Principles Practice 24e p. 1281-1283
Practise the full DSSSB - 29 August 2019 (Shift-2)
Attempt every question from this paper in a timed mock, then review the full solution for each one.