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
MITSUDA REACTION is read after- 
Select and explain. 
A. 3 days, B. 3 hours, C. 3 weeks, D. 3 months.
C: 3 weeks
Answer: C: 3 weeks 
Explanation: None