This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Alopecia, Subject name: Skin
Coarse pitting of nails is seen in? 
Select and explain. 
A. Psorati carthiritis, B. Dermatitis herpetiformis, C. Bullous pemphigoid, D. Pemphigus vulgaris
A: Psorati carthiritis
Answer: A: Psorati carthiritis 
Explanation: Ans. (a) Psoratic arthiritisRef: Rook's 8/e, p 65.13