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
Aldosterone secretion is increased when there is a fall in 
Select and explain. 
A. Plasma K+, B. Plasma Na+, C. pH of the plasma, D. Angiotensin II levels
B: Plasma Na+
Answer: B: Plasma Na+ 
Explanation: None