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': 'A 3 year old child can do all, except – \nSelect and explain. \nA. Eat with a spoon, B. Climb stairs running, C. Walk properly, D. Vocabulary of 20–100 words', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Important milestones of a 3 years child\n\nRides tricycle \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nStands momentarily on one foot. \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nDraws a circle. \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nCan dress or undress himself completely \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nBuilds tower of 10 cubes\xa0\nKnows his age and sex.\xa0\xa0\xa0\xa0\xa0\xa0\nRepeat a sentence of 6 syllables\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nHas a vocabulary of 250 words.\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nCounts 3 objects correctly.\xa0\xa0\xa0\xa0\nCan withhold and postpone bowel movement.', 'role': 'assistant'}]