This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'A patient has history suggestive aspergillosis features(s) which would be seen includes \nSelect and explain. \nA. Serum precipitins aspergillus, B. Elevated serum IgE, C. Peripheral eosinophllia, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Aspergillus precipitin is a laboratory test performed on your blood. It's ordered when a doctor suspects that you have an infection caused by the fungus Aspergillus. The test may also be called: aspergillus fumigatus 1 precipitin level test Ref Davidson 23rd edition pg 624", 'role': 'assistant'}]