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
child rolls over by ? 
Select and explain. 
A. 3 months, B. 5 months, C. 7 months, D. 8 months
B: 5 months
Answer: B: 5 months 
Explanation: O.P. Ghai 7th ed, page7 Achild rolls over by 5 months