This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
Sperm motility is increased in 
Select and explain. 
A. Increased temperature, B. Acidic environment, C. Vaginal secretions, D. Seminiferous tubules
C: Vaginal secretions
Answer: C: Vaginal secretions 
Explanation: Sperm motility describes the ability of sperm to move properly through the female reproductive tract (internal feilization)Ref: Ganong&;s review of medical physiology;24th edition; page no:-421