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: Radiology
[{'content': 'The earliest evidence of Rickets is seen by: \nSelect and explain. \nA. Radiological examination of growing end of bone, B. S. alkaline phosphatase level, C. S. calcium level, D. S. phosphorus level', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Radiological examination of growing end of bone', 'role': 'assistant'}]