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
A 3 year old child can do all, except - 
Select and explain. 
A. Eat with a spoon, B. Climb stairs running, C. Walk properly, D. Vocabulary of 20-100 words
B: Climb stairs running
Answer: B: Climb stairs running 
Explanation: Ans. is 'b' i.e., Climb stairs running