When both ovaries of human are removed then which hormone is decreased in blood :-

Options

A. Oxytocin
B. Prolactin
C. Estrogen
D. Gonadotropin releasing factor

Answer

To answer the question regarding which hormone decreases in the blood when both ovaries are removed, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Ovaries**: The ovaries are responsible for producing several hormones, primarily estrogen and progesterone. These hormones play crucial roles in the menstrual cycle and reproductive health.

2. **Identify the Hormones Produced by Ovaries**: The main hormones produced by the ovaries include:
- Estrogen
- Progesterone
- Inhibin

3. **Consider the Effects of Ovarian Removal**: When both ovaries are removed (a procedure known as oophorectomy), the production of these hormones will cease. This will lead to a significant decrease in the levels of estrogen and progesterone in the blood.

4. **Focus on Estrogen and Progesterone**: Among the hormones produced by the ovaries, estrogen is particularly significant as it regulates various functions, including the menstrual cycle and secondary sexual characteristics.

5. **Conclusion**: Since both estrogen and progesterone levels will drop due to the removal of the ovaries, the hormone that is most notably decreased in the blood is **estrogen**.

### Final Answer:
When both ovaries of a human are removed, the hormone that is decreased in the blood is **estrogen**.

---