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 child speaks sentences at the age of ? \nSelect and explain. \nA. 6 months, B. 1 year, C. 18 months, D. 2 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: At 2 years, a child can make simple sentences and uses pronouns.', 'role': 'assistant'}]