This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Physiology
Most potent stimulus for renin release is - 
Select and explain. 
A. Sympathetic stimulation, B. Decreased NaCl in DCT, C. Prostacycline, D. Hypotension
D: Hypotension
Answer: D: Hypotension 
Explanation: Ans. is 'd' i.e., Hypotension o Hypotension causes reduced renal perfusion pressure - most powerful stimulus for renin release.