This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: mycology, Subject name: Microbiology
Farmer&;s lung is caused by 
Select and explain. 
A. Micromonospora faenia, B. Aspergillosis, C. Histoplasma capsulatam, D. All of the above
A: Micromonospora faenia
Answer: A: Micromonospora faenia 
Explanation: Farmer&;s lung - systemic and pulmonary reactions resulting from inhalation of dust from hay mould, mouldy straw, threshing dust, or by persons who have become hypersensitive to antigens in the dust, most often associated with inhalation of spores of micromonospora faenia or thermoactinomyces vulgaris. Ref: Baveja textbook of microbiology; 4th edition