The first encounter of immune response with an antigen is called

Primary immune response

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Secondary immune response

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Memory

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Clonal selection

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Solution

The correct option is D Primary immune response
The Immune response is the body's response caused by its immune system being activated by antigens. The first contact with an antigen which sensitizes individual who is affected is known as a primary immune response. The primary immune response occurs when an antigen comes in contact to the immune system for the first time.
So, the correct answer is 'Primary immune response'.

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