Mention one application for each of the following :
(a) Passive immunization
(b) Antihistamine
(c ) Colostrum
(d) Cytokine - barrier

Explanation

To answer the question, we need to provide one application for each of the four terms: passive immunization, antihistamine, colostrum, and cytokine barrier. Here’s a step-by-step breakdown:

### Step 1: Passive Immunization
- **Application**: Passive immunization involves the introduction of ready-made antibodies into an individual. A common application is the administration of antivenom for snake bites or tetanus immunoglobulin for tetanus exposure. This is crucial in situations where immediate protection is needed and there is no time for the body to produce its own antibodies.

### Step 2: Antihistamine
- **Application**: Antihistamines are used to alleviate allergic reactions. They work by blocking the action of histamine, a substance in the body that causes allergic symptoms. An example of their application is in treating hay fever or allergic rhinitis, where they help reduce symptoms like sneezing, itching, and runny nose.

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