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: Pediatrics
[{'content': 'True about vit–D deficiency rickets –a) Vit. D3 given at a dose of 50–150 mg/dayb) X–ray knee joint is diagnosticc) Rickety rosary is tenderd) Increased chances of respiratory tract infectione) Hyponatrernia \nSelect and explain. \nA. c, B. bd, C. ab, D. ac', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]