The process in which an antibody comes in contact with its antigen and converts it into harmless insoluble matter is called

Activation

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Agglutination

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Neutralisation

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Opsonisation

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Solution

The correct option is B Agglutination
When a particulate antigen interacts with its antibody in the presence of electrolytes at a suitable temperature and pH, they are converted into a mass of harmless, insoluble matter called agglutinins and the process is known as agglutination.
Neutralization involves neutralizing toxins released by bacteria with antibodies. Opsonization involves the coating of bacteria to facilitate the phagocytosis by cells. Activation is a generic term used in multiple instances to signify the process of making a substance chemically or catalytically active.

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