Which one of the following statements is correct with respect of immunity ?

Options

A. Antibodies are protein molecules, each of which has four light chains
B. Rejection of a kideny graft is, the function of B-lymphocytes
C. Preformed antibodies need to be injected to treat the bite by a viper snake
D. The antibodies against small pox pathogen are produced by T-lymphocytes

Answer

To determine which statement is correct with respect to immunity, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze Option A**:
- The statement claims that antibodies are protein molecules each having 4 light chains.
- This is incorrect because antibodies consist of 2 light chains and 2 heavy chains. Therefore, Option A is false.

2. **Analyze Option B**:
- The statement suggests that the rejection of a kidney graft is the function of B lymphocytes.
- This is incorrect because the rejection of a kidney graft is primarily mediated by T-lymphocytes, not B-lymphocytes. Therefore, Option B is false.

3. **Analyze Option C**:
- The statement claims that preformed antibodies need to be injected to treat the bite of a viper snake.
- This is correct because anti-snake venom is produced by injecting small amounts of snake venom into a horse, which generates antibodies. These antibodies are then collected and used to treat snake bites. Therefore, Option C is true.

4. **Analyze Option D**:
- The statement asserts that antibodies against the smallpox pathogen are produced by T-lymphocytes.
- This is incorrect because antibodies against smallpox are produced by B-lymphocytes. Therefore, Option D is false.

### Conclusion:
After analyzing all options, the correct statement with respect to immunity is **Option C**: "Preformed antibodies need to be injected to treat the bite of a viper snake."

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