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 apalsia is seen with all except ? 
Select and explain. 
A. Methicillin, B. Chloramphenicol, C. Alpha methyl hydantoin, D. Phenylbutazone
A: Methicillin
Answer: A: Methicillin 
Explanation: Ans. is 'a' i.e., Methicillin Causes of drug induced aplastic anemia Antibiotics Chloramphenicol Cotrimoxazole Nitroforantoin Antiinflammatory Phenylbutazone lndomethacin Diclofenac Antithyroid Carbimazole Methimazole Methylthiouracil Psychotropic Phenothiazine Anticonvulsant Phenytoin (alpha methyl hydantoin) Antirheumatic Gold salts D penicillamine Cytotoxic drugs Vincristine Adriamycin Methotrexate Chlorambucil