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
[{'content': 'Nasal allergy is most often due to - \nSelect and explain. \nA. Pollen grains, B. Animal dust, C. House dust, D. Automobile dust', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Allergic rhinitis (Hay fever) is initiated by Sensitivity reactions to one of a large group of allergens most commonly the plant pollens, fungi, animal allergens, and dust mites.', 'role': 'assistant'}]