Read the passage and answer the following question.

Rahul went for a vacation along with his friends to a town located in countryside during summers. The house on which they stayed was surrounded by farmland by all sides. Lots of crops was growing nearby and Rahul was very excited to visit the crop fields. He went to the fields along with his friends and spent 2 to 3 hours in the fields. On returning back Rahul had running nose, watering eyes and continuous sneezing which was very frequent. the symptoms worsened with time.

How can allergy be diagnosed in a person? (Question 2)

Presence of large amount of IgE antibodies in the blood.

IgE is an immunoglobulin which when present in large amount of blood indicates that the person is allergic to something.