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': 'Vitamin beneficial in osteoporosis in combination with Vitamin D is: \nSelect and explain. \nA. Vitamin E, B. Vitamin A, C. Vitamin K, D. Vitamin B', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]