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
Which of the following about cholera is true - 
Select and explain. 
A. Invasive, B. Endotoxin is released, C. Recent infections in india are of classical type, D. Vibriocidal antibody titre measures prevalence
D: Vibriocidal antibody titre measures prevalence
Answer: D: Vibriocidal antibody titre measures prevalence 
Explanation: None