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 effects are mediated by stimulation of which of the following second messengers - 
Select and explain. 
A. cAMP, B. cGMP, C. Ca++ - Calmodulin, D. IP3 / DAG
A: cAMP
Answer: A: cAMP 
Explanation: None