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
[{'content': "Type IV Hypersensitivity- \nSelect and explain. \nA. Farmer's lung, B. Contact hypersensitivity, C. Immediate hypersensitivity, D. Myasthenia gravis", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Contact hypersensitivity", 'role': 'assistant'}]