This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
Thimble pitting of nails is seen in - 
Select and explain. 
A. Psoriasis, B. Pemphigus, C. Lichen planus, D. Alopecia areata
D: Alopecia areata
Answer: D: Alopecia areata 
Explanation: most common feature of psoriatic nail is coarse pitting of nail plate Ref Harrison20th edition pg 1208