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: Pharmacology
Hormonal stimulation of the formation of second messenger inositol 1, 4, 5-triphosphate (IP3) quickly leads to the release of which other intracellular messenger? 
Select and explain. 
A. Cyclic AMP, B. Prastaglandin, C. Calcium, D. Leukotriene
C: Calcium
Answer: C: Calcium 
Explanation: Ans. is 'c' i.e., Calcium o 1P3 mobilizes Ca'from intracellular organelles and increases cytosolic Ca' and then Ca" acts as third messenger.