The hormone that causes the formation of the corpus luteum and is also the ovulation hormone is:Group of answer choicesestrogen.LH.FSH.progesterone.

The hormone that causes the formation of the corpus luteum and is also the ovulation hormone is LH (Luteinizing Hormone).

Here's a step-by-step explanation:

1. The menstrual cycle begins with the Follicular Phase where the Follicle Stimulating Hormone (FSH) stimulates the growth of ovarian follicles in the ovary before the release of an egg from one follicle at ovulation.

2. As the follicles mature, they release estrogen which helps to thicken the lining of the uterus to prepare for possible pregnancy.

3. The rise in estrogen levels triggers the release of Luteinizing Hormone (LH). This is often referred to as the 'LH surge' and usually leads to ovulation within 24 to 36 hours.

4. Ovulation is the release of a mature egg from the ovarian follicle into the fallopian tube.

5. After ovulation, the ruptured follicle closes after releasing the egg and forms a corpus luteum, which produces progesterone.

6. Progesterone prepares the body for pregnancy in the event that the egg is fertilized. If the egg is not fertilized, the corpus luteum breaks down, the production of progesterone falls, leading to menstrual bleeding and the start of a new cycle.

So, the hormone that triggers ovulation and causes the formation of the corpus luteum is LH.