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
Bysinnosis is caused by: March 2010 
Select and explain. 
A. Bagasse, B. Mold hay, C. Cotton, D. Bird droppings
C: Cotton
Answer: C: Cotton 
Explanation: Ans. C: Cotton