This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'Diluent for trimethoprim in antibiotic disc for sensitivity testing is \nSelect and explain. \nA. Na OH solution, B. Na hco3, C. Ethanol, D. Acetic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diluent for trimethoprim in antibiotic sensitivity testing is acetic acid Sod bicarbonate for amoxicillin and ceftazidime Ref: Textbook of Microbiology Baveja 4th ed Pg 629', 'role': 'assistant'}]