This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology in Relation to Reproduction, Subject name: Gynaecology & Obstetrics
In Kartagener syndrome cause of infertility is? 
Select and explain. 
A. Oligospermia, B. Asthenospermia, C. Undescended testis, D. Epididymis obstruction
B: Asthenospermia
Answer: B: Asthenospermia 
Explanation: (b) Asthenospermia,Ref: Clinical Gynecologic Endocrinology and Infertility, 8th ed.* Kartagener syndrome is also known as primary ciliary dyskinesia.* It is identified as a cause of male infertility as it affects ciliary structure and function and thus causes oligo-asthenospermia (poor sperm motility). It is primarily a disorder of sperm transport so if one option is to be chosen, asthenospermia is the answer of choice.* Affected individuals also have chronic respiratory infections as cilia of respiratory tract are also affected.