Match the terms given under column 'A' with their functions given under column 'B' and select the answer from the options given below :
`{:(,"Column A",,"Column B"),("A.","Lymphatic","i.","Carries oxygenated"),("B.","Pulmonary vein","ii.","Immune response"),("C.","Thrombocytes","iii",underset(underset("circulatory system")("tissue fluid to the"))("To drain back the")),("D.","Lymphocytes","iv.","Coagulation of blood"):}`
Options :

Options

A. `{:(," A" " B" " C" " D"),(," 2" " 1" " 3" " 4"):}`
B. `{:(," A" " B" " C" " D"),(," 3" " 1" " 4" " 2"):}`
C. `{:(," A" " B" " C" " D"),(," 3" " 1" " 3" " 4"):}`
D. `{:(," A" " B" " C" " D"),(," 2" " 1" " 3" " 4"):}`

Explanation

To solve the matching question between Column A and Column B, we will analyze each term in Column A and find its corresponding function in Column B.

### Step-by-Step Solution:

1. **Identify the first term in Column A: Lymphatic**
- The lymphatic system is responsible for draining excess tissue fluid back into the circulatory system.
- **Match:** Lymphatic → iii. To drain back the tissue fluid to the circulatory system.

2. **Identify the second term in Column A: Pulmonary vein**
- The pulmonary vein carries oxygenated blood from the lungs to the heart.
- **Match:** Pulmonary vein → i. Carries oxygenated blood.

3. **Identify the third term in Column A: Thrombocytes**
- Thrombocytes, also known as platelets, play a crucial role in blood coagulation (clotting).
- **Match:** Thrombocytes → iv. Coagulation of blood.

4. **Identify the fourth term in Column A: Lymphocytes**
- Lymphocytes are a type of white blood cell that is integral to the immune response, helping to fight infections.
- **Match:** Lymphocytes → ii. Immune response.

### Final Matching:
- A. Lymphatic → iii. To drain back the tissue fluid to the circulatory system.
- B. Pulmonary vein → i. Carries oxygenated blood.
- C. Thrombocytes → iv. Coagulation of blood.
- D. Lymphocytes → ii. Immune response.

### Conclusion:
The correct matching is:
- A → iii
- B → i
- C → iv
- D → ii

The answer corresponds to **Option 2**.