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: Pharmacology
[{'content': 'Bone marrow aplasia is seen with all except : \nSelect and explain. \nA. Methicillin, B. Chloramphenicol, C. Alpha methyl hydantoin, D. Phenylbutazone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methicillin Causes of drug induced aplastic anemia Antibiotics Psychotropic * Chloramphenicol * Phenothiazine * Cotrimoxazole Anticonvulsant * Nitrofurantoin * Phenytoin * Carbamazepine * Valproate Antiinflammatory Antirheumatic * Phenylbutazone * Gold salts * Indomethacin * D penicillamine * Diclofenac Cytotoxic drugs Antithyroid * Vincristine * Carbimazole * Andriamycin * Methimazole * Methotrexate etc. * Methylthiouracil', 'role': 'assistant'}]