This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
[{'content': 'Dapsone is NOT used in: March 2013 \nSelect and explain. \nA. Alopecia areata, B. Leprosy, C. Dermatitis herpetiformis, D. Malarial prophylaxis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Alopecia areata Alopecia areata (AA) Non-cicatricial/ non scaring alopecia Exclamation mark sign is characteristic Clinical presentation: Single or multiple circumscribed smooth patchy hair loss, most obviously on scalp but frequently involving any hair bearing skin like beard, eyebrows, eyelashes, with pathognomic "exclamation marks" and "going gray overnight" phenomenon AA is treated by: Minoxidil', 'role': 'assistant'}]