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: Pathology
Type IV Hypersensitivity- 
Select and explain. 
A. Farmer's lung, B. Contact hypersensitivity, C. Immediate hypersensitivity, D. Myasthenia gravis
B: Contact hypersensitivity
Answer: B: Contact hypersensitivity 
Explanation: Ans. is 'b' i.e., Contact hypersensitivity