Hypercalcemic hormone is

Options

A. Thyroxine
B. Tri-iodo-thyronine
C. Parathormone
D. Thyrocalcitonin.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the identity of the hypercalcemic hormone. Hypercalcemic hormones are those that increase calcium levels in the blood.

2. **Identifying the Options**: The options given are:
- A) Thyroxine
- B) Triiodothyronine
- C) Parathormone
- D) Thyrocalcitonin

3. **Analyzing Each Option**:
- **Thyroxine**: This hormone is produced by the thyroid gland and primarily regulates metabolism. It does not have a direct role in increasing calcium levels, so it is not the answer.
- **Triiodothyronine**: Similar to thyroxine, this hormone is also related to thyroid function and metabolism, not calcium regulation. Thus, it is not the answer.
- **Parathormone (PTH)**: This hormone is secreted by the parathyroid glands and is known to increase calcium levels in the blood while decreasing phosphate levels. This aligns with the definition of a hypercalcemic hormone.
- **Thyrocalcitonin**: More commonly known as calcitonin, this hormone lowers blood calcium levels, which makes it the opposite of a hypercalcemic hormone.

4. **Conclusion**: Based on the analysis, the hormone that acts as a hypercalcemic hormone is **Parathormone (PTH)**. Therefore, the correct answer is option C.

---