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': 'Loop diuretics acts on ? \nSelect and explain. \nA. Descending limb, B. Thick ascending limb, C. Coical segment, D. Collecting duct', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is b' i.e., Thick ascending limb", 'role': 'assistant'}]