This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
[{'content': 'Which of the following combination is true about hormone and its site of action in renal tubules? \nSelect and explain. \nA. Aldosterone in collecting ducts, B. Angiotensin in distal tubule, C. ANP in loop of Henle, D. ADH in proximal tubule', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A Aldosterone in collecting ductsRef: Guyton, 10th ed. pg. 290, 304Hormones and their site of ActionHormonesSite of action in kidneyAngiotensin IIConstricts afferent arterioles, helps to reduce GFRAldosteroneCortical collecting duct & distal tubulesADHMedullary collecting ductANPCollecting duct', 'role': 'assistant'}]