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': 'In blood culture the ratio of blood to reagent is ? \nSelect and explain. \nA. 1:05, B. 1:20, C. 1:10, D. 0.111111111', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 1:10", 'role': 'assistant'}]