This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
The patch test is read after 
Select and explain. 
A. 2 hours, B. 2 days, C. 2 months, D. 2 weeks
B: 2 days
Answer: B: 2 days 
Explanation: The patch test is read after 48 to 72 hrs and then again after a week. It is read at 20 mins to see any immediate reaction Ref: Harrison 20th edition pg 1256