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Allergies are classified based on
Allergies are classified based on
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Solution
The correct option is C Period of occurrence
Based on the period of occurrence of allergy, it can be classified into seasonal and perennial. When the allergy occurs for a particular time of the year, it is called seasonal allergy. Example: Hay fever. Allergies that are not linked to any particular season and can occur at any point of time of the year are called perennial allergies. Examples: Allergy to dust, insect bites, allergy to food substances etc.
Period of occurrence
Based on the period of occurrence of allergy, it can be classified into seasonal and perennial. When the allergy occurs for a particular time of the year, it is called seasonal allergy. Example: Hay fever. Allergies that are not linked to any particular season and can occur at any point of time of the year are called perennial allergies. Examples: Allergy to dust, insect bites, allergy to food substances etc.
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