This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Which of the following drugs causes osteoporosis on long term use: \nSelect and explain. \nA. Etidronate, B. Prednisolone, C. Phenytoin, D. Calcitriol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) Prednisolone(Ref: KDT 8/e p318)* Etidronate and phenytoin cause osteomalacia whereas calcitriol is used in treatment of osteoporosis.', 'role': 'assistant'}]