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: Medicine
Two litres of normal saline in 4 hours will stimulate secretion of - 
Select and explain. 
A. Atrial natriuretic peptide, B. IL - 2, C. TNF - alpha, D. Prostaglandins
A: Atrial natriuretic peptide
Answer: A: Atrial natriuretic peptide 
Explanation: None