This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
[{'content': 'A child changes rattle from one hand to the other hand at the age of: \nSelect and explain. \nA. 3 months, B. 6 months, C. 12 months, D. 15 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. 6 monthsA child transfers object, or changes rattle from one hand to the other hand by the age of 5-7 months. Therefore, here the best answer is 6 months.', 'role': 'assistant'}]