Which of the following is $NOT$ a symptom of an allergy?

$A$ non-infectious,unnatural,and unusual reaction of a person to any substance or condition for which they are hypersensitive is termed as:

To determine the cause of an allergy,a patient is given.........

Ramesh frequently sneezes due to an allergy. Which medicine will the doctor prescribe to him?

Which type of chemicals secreted from mast cells cause allergies?

Define the following terms: $PAP$ smear and Allergens.