This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous Disorders, Subject name: Skin
[{'content': 'The most common association with coarse pitting of nails and onycholysis is: \nSelect and explain. \nA. Cicatricial alopecia, B. Well defined scaly plaques, C. Polygonal papule, D. Violaceous papules', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Well defined scaly plaquesPolygonal violaceous (purple) papules and cicatricial alopecia is seen in lichen planus', 'role': 'assistant'}]