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
In blood culture, the ratio of blood to reagent is - 
Select and explain. 
A. 1:05, B. 1:20, C. 1:10, D. 0.111111111
C: 1:10
Answer: C: 1:10 
Explanation: None