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': 'Congenital bilateral absence of vas deferens is genetically related to \nSelect and explain. \nA. Noonan syndrome, B. Down syndrome, C. Kartageners syndrome, D. Cystic fibrosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Congenital bilateral absence of vas deferens is associated with cystic fibrosis.', 'role': 'assistant'}]