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: Surgery
[{'content': 'The life of preserved semen for artificial insemination is - \nSelect and explain. \nA. One year, B. Two year, C. Five year, D. Ten year', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]