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': 'True for a 2yrs old boy is \nSelect and explain. \nA. Weight four times that of bih weight, B. Rides bicycle, C. Climbs up and down the stairs with alternating steps, D. Ossification center for radius head appears', 'role': 'user'}, {'content': 'Answer: A \nExplanation: At 2yrs weight becomes 4 times that of bih ( at bih 3kgs, at 2yrs 12kgs) A child is able to ride a bicycle by the age of 3yrs A child is able to climb up and down the stairs at 4yrs Ossification center for radius head appears at 3-4 yrs of age. Ref: Ghai ,9th edition, chapter 2 & 3.', 'role': 'assistant'}]