This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
Causative agent for Farmers' Lung is? 
Select and explain. 
A. Thermoactinomyces sacchari, B. Thermophiles actinomyces, C. Cotton dust, D. Pigeon feather
B: Thermophiles actinomyces
Answer: B: Thermophiles actinomyces 
Explanation: Ans. is 'b' i.e., Thermophiles actinomyces * Farmer's lung is a hypersensitivity (type III) pneumonitis induced by the inhalation of biologic dusts coming from hay dust or mold spores or any other agricultural products.* These types of immune response are most often initiated by exposure to thermophilic actinomycetes (most commonly Saccharopolyspora rectivirgula).