This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dermatitis, Subject name: Dental
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: Ref Harrison20th edition pg 2345