Which of the following develops immune system in the body?

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(a) Antigen — The immune system has a vital role. It protects body from harmful substances, germs and cell changes that can make ill. It is made up of various organs, cells and proteins. The immune system can be activated by many different things that the body doesn’t recognize as its own. These are called antigens. Examples of antigens include the proteins on the surfaces of bacteria, fungi and viruses.

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(B) Antibody

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(C) Enzymes

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(D) Hormones

Which of the following develops immune system in the body?

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