This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Medicine
[{'content': 'Infertility in Kartagener: \nSelect and explain. \nA. Oligospermia, B. Blockage of epididymis, C. Asthenozoospermia, D. Undescended testes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Asthenozoospermia* Kartagener is a primary ciliary disorder and as such the sperms have abnormal/reduced motility (asthenozoospermia).* Blockage of epididymis is a feature of Young syndrome (but there is no situs inversus like Kartagener syndrome and patients tends to have normal sperm motility)', 'role': 'assistant'}]