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': 'Drug induced pemphigus is most commonly caused by – \nSelect and explain. \nA. Penicillamine, B. Phenytoin sodium, C. Carbamazepine, D. Penicillin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Drug induced pemphigus is caused by penicillamine, rifampicin and captopril.', 'role': 'assistant'}]