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: Social & Preventive Medicine
"Farmer's Lung" is due to inhalation of-(mmiE as) 
Select and explain. 
A. Cotton fiber, B. Sugarcane fiber, C. Hay dust, D. Coal dust
C: Hay dust
Answer: C: Hay dust 
Explanation: Ans. is 'c' i.e., Flay dust