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: Pharmacology
[{'content': 'The primary site of action of triameterene and spironolactone is the - \nSelect and explain. \nA. Proximal tubule, B. Distal tubule, C. Ascending Loop of Henle, D. Descending Loop of Henle', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Distal tubule o Potassium sparing diuretics (Sprionolactone and triameterene) act on late distal tubule and collecting duct.", 'role': 'assistant'}]