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: Dental
[{'content': 'Coin shaped eczema is – \nSelect and explain. \nA. Nummular eczema, B. Atopic acema, C. Infantile eczema, D. Endogenous eczema', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nummular eczema (discoid eczema) is characterized by multiple, itchy, scaly, coin shaped exudative plaques on extremities in middle-aged men.', 'role': 'assistant'}]