This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': '2 years old child can do - \nSelect and explain. \nA. Can ride tricycles, B. Climb up and downstairs with one step each time, C. Knows sex and age, D. Handles spoon well', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Climb up and downstairs with one each step time o A child can ride a tricycle by 3 years. o A child can walk up and downstairs with one step at a time by 2 years. o A child knows his sex and age by 3 years. o A child can feed himself with spoon without spilling its contents by 15 months. o A child can tell a story by 4 years.", 'role': 'assistant'}]