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': 'Absence of fructose in semen indicates - \nSelect and explain. \nA. Obstruction to seminal vesicles, B. Obstruction at prostatic urethra, C. Vas deferens obstruction, D. Testicular failure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: An absence of fructose in the semen would indicate → seminal vesicle agenesis or obstruction of its duct or the ejaculatory duct.', 'role': 'assistant'}]