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': 'Vocabulary of 1.5 year old child is – \nSelect and explain. \nA. 1–10 words, B. 10–20 words, C. 20–30 words, D. 30–40 words', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]