This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Hypersensitivity pneumonitis is/are caused by - 
Select and explain. 
A. Coal worker's pneumoconiosis, B. Bagassosis, C. Silicosis, D. Sarcoidosis
B: Bagassosis
Answer: B: Bagassosis 
Explanation: Bagassosis can lead to hypersensitivity pneumonitis,in which the antigen is thermophilic actinomycetes and the source of antigen is "moldy" bagasse (sugarcane).Other examples for HP include bird fancier's lung,farmer's lung,hot tube lung,chemical worker's lung,bird fancier's lung,etc. Reference:Harrison's medicine-18th edition,page no::2117.