Which of the following cause perennial allergy?

Dust

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Food substance

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Animal dander

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Insect bites

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Solution

The correct options are
A
Dust

B
Food substance

C
Animal dander

D
Insect bites

Allergies that are not linked to any particular season and can occur at any time of the year are called perennial allergy. Perennial allergies are often caused due to house dust. House dust may contain mould and fungal spores, fibres of the fabric, animal dander. Substances in and on cockroaches are often the cause of allergic symptoms.

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