This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'child rolls over by ? \nSelect and explain. \nA. 3 months, B. 5 months, C. 7 months, D. 8 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: O.P. Ghai 7th ed, page7 Achild rolls over by 5 months', 'role': 'assistant'}]