This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchiectasis, Subject name: Medicine
[{'content': 'Infeility in Kaagener syndrome is due to? \nSelect and explain. \nA. Oligospermia, B. Blockage of epididymis, C. Asthenospermia, D. Undescended testis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Asthenospermia or poor sperm motility is due to missing dynein arms, which is the basic defect of Kaagener's syndrome. It is a ciliopathic, autosomal recessive genetic disorder. Around 90% of individuals with kaagener's have ultrastructural defects affecting protein(s) in the outer and/or innerdynein arms. Triad consist of:- - situs inversus - chronic sinusitis - bronchiectasis.", 'role': 'assistant'}]