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: Microbiology
The cholera vibrio - 
Select and explain. 
A. Is strongly anaerobic, B. Grows best at 25degC, C. Has marked tolerance of alkaline pH, D. Grows over a wide range but best at a slight acid pH
C: Has marked tolerance of alkaline pH
Answer: C: Has marked tolerance of alkaline pH 
Explanation: Ans. is 'c' i.e., Has marked tolerance of alkaline pH