This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
[{'content': 'Which of the following X-ray should be advised for age determination between 1-13 years of age \nSelect and explain. \nA. Shoulder, B. Wrist, C. Elbow, D. Iliac bones', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A bone age study helps doctors estimate the maturity of a child&;s skeletal system. It&;s usually done by taking a single X-ray of the left wrist, hand, and fingers. It is a safe and painless procedure that uses a small amount of radiation. ... The bone age is measured in years . Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]