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: Physiology
CAMP acts through: 
Select and explain. 
A. Activation of protein kinase, B. Activation of adenylate cyclase, C. Ca2+ release., D. All
A: Activation of protein kinase
Answer: A: Activation of protein kinase 
Explanation: A i.e., Activation of protein kinase