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
Bone marrow aplasia is seen with all except : 
Select and explain. 
A. Methicillin, B. Chloramphenicol, C. Alpha methyl hydantoin, D. Phenylbutazone
A: Methicillin
Answer: A: Methicillin 
Explanation: 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