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
[{'content': 'Aldosterone secretion is increased when there is a fall in \nSelect and explain. \nA. Plasma K+, B. Plasma Na+, C. pH of the plasma, D. Angiotensin II levels', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]