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
Nasal allergy is most often due to - 
Select and explain. 
A. Pollen grains, B. Animal dust, C. House dust, D. Automobile dust
A: Pollen grains
Answer: A: Pollen grains 
Explanation: 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.