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
[{'content': "Which of the following is a causative agent of Farmer's Lung? \nSelect and explain. \nA. Thermophilic Actinomycetes, B. Aspergillus Fumigatus, C. Actinobacter, D. Aspergillus Flavus", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref: Harrison 20th edition, P 1970Farmers lung is a hypersensitivity pneumonitis which is caused by thermophilic actinomycetes. The same organism grows on sugarcane dust and is the antigen leading to Bagassosis.DiseaseAntigenSourceFarming/Food ProcessingFarmer's lungThermophilic Actinomycetes (e.g., Saccharopolyspora rectivirgula); fungusGrain, moldy hay, silage SugarcaneBagassosisThermophilic actinomycetes", 'role': 'assistant'}]