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
Which of the following is the impoant marker of male infeility in semen analysis? 
Select and explain. 
A. Motility, B. Concentration, C. Volume, D. Sperm Count
B: Concentration
Answer: B: Concentration 
Explanation: Ans. B. ConcentrationRef: Clinical Gynecologic Endocrinology Infeility, 8' ed.Sperm concentrationand progressive motility is impoant in distinguishing feile from infeile men but strict sperm morphology is one of the most discriminating value.