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
Specific reason to disallow the sample for culture- 
Select and explain. 
A. Sample brought within 2 hr of collection, B. Sample brought in sterile plastic container, C. Sample brought in formalin, D. Sample obtained after cleaning the collection site
C: Sample brought in formalin
Answer: C: Sample brought in formalin 
Explanation: None