One of the following is correct statement

Options

A. T4 is more active than T3
B. T3 is more active than T4
C. T3 and T4 are the same
D. None of the above

Answer

To determine which statement regarding the thyroid hormones T3 and T4 is correct, we need to analyze the activity levels of these hormones.

### Step-by-Step Solution:

1. **Identify the Hormones**:
- The two primary hormones produced by the thyroid gland are T3 (triiodothyronine) and T4 (thyroxine or tetraiodothyronine).

2. **Understand the Function of T3 and T4**:
- Both hormones are involved in regulating metabolism, growth, and development. They are essential for normal physiological functions.

3. **Compare the Activity of T3 and T4**:
- T3 is known to be more biologically active than T4. This means that T3 has a stronger effect on the body's metabolism and other functions compared to T4.

4. **Evaluate the Given Statements**:
- The statements provided are:
- T4 is more active than T3
- T3 is more active than T4
- T3 and T4 are the same
- None of the above
- Based on our understanding, the correct statement is that T3 is more active than T4.

5. **Conclusion**:
- Therefore, the correct answer is: **T3 is more active than T4**.