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': 'Which of the following is a high ceiling diuretic ? \nSelect and explain. \nA. Furosemide, B. Spironolactone, C. Acetazolamide, D. Thiazide', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Furosemide o Loop diuretics are called high ceiling diuretics because, progressive increase in dose is matched by increasing diuresis, i.e. they have a high ceiling effect. o Furosamide is a loop diuretics.", 'role': 'assistant'}]