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: Microbiology
[{'content': 'Compound used for fixation of protozoa found in stool is: \nSelect and explain. \nA. Phenol, B. Hypochlorite, C. Formalin, D. Alcohol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d. Alcohol', 'role': 'assistant'}]