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: Gynaecology & Obstetrics
[{'content': 'Which of the following is the best specimen for semen analysis : \nSelect and explain. \nA. A condom specimen, B. A specimen obtained by masturbation near the laborator, C. A specimen obtained by colitus interuptus into a wide-vessel, D. B + D', 'role': 'user'}, {'content': 'Answer: D \nExplanation: B + D', 'role': 'assistant'}]