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': "Selective medium for Vibrio cholerae ? \nSelect and explain. \nA. GTTA medium, B. Stua medium, C. Skirrow's medium, D. MYPA medium", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., GTTA medium", 'role': 'assistant'}]