This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteoporosis, Sex Hormones and OCPs, Subject name: Pharmacology
[{'content': 'Which of the following drug is implicated in the causation of osteomalacia of the bone? \nSelect and explain. \nA. Phenytoin, B. Steroids, C. Heparin, D. Estrogen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phenytoin inhibit the hepatic production of 25 hydroxy vitamin D and also directly inhibit bone mineralization and thus may result in osteomalacia. Steroids and heparin result in osteoporosis not osteomalacia. Impoant drugs causing osteomalacia are: Phenytoi Carbamazepine Valproate Phenobarbitone Bisphosphonates', 'role': 'assistant'}]