Yes you do so you can get all the types of healthy food there is
It helps your body get used to the allergen better. It just depends on the allergy.
Carrots are going to be the best choice here. They are rich in vitamin A, which is an awesome powerful amazingly magnificent super hero nutrient! =D
I would say A because it sounds the most positive and sometimes people need a little push to get confidence to follow their dreams and be successful.