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: Forensic Medicine
[{'content': 'Primary dentition is complete by: UPSC 08 \nSelect and explain. \nA. 1.5 years, B. 2.5 years, C. 3.5 years, D. 4.5 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. 2.5 years', 'role': 'assistant'}]