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
Cholera toxin acts by - 
Select and explain. 
A. Na ATPase inhibition, B. Adenylate cyclase stimulation, C. Opening of chloride channel, D. Stimulation of Ca' channel
B: Adenylate cyclase stimulation
Answer: B: Adenylate cyclase stimulation 
Explanation: Ans. is `b' i.e., Adenylate cyclase stimulation