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
[{'content': 'Sperm motility is increased in \nSelect and explain. \nA. Increased temperature, B. Acidic environment, C. Vaginal secretions, D. Seminiferous tubules', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]