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': 'A newborn doubles his height at bih by what age? \nSelect and explain. \nA. 2 & half years, B. 3 & half years, C. 4 & half years, D. 5 & half years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Height at bih is 50cms At 6 months- 65 cms At 1yr- 75cms At 2yrs- 90cms At 3yrs- 95cms At 4yrs- 100cms Hithero, height at bih doubles by the age of 4 yrs. Ref: Ghai, 9th edition, Chapter 2.', 'role': 'assistant'}]