Q31. A spike in which hormone is absolutely necessary for ovulation to occur?a) Luteinizing hormoneb) Prolactinc) Progesteroned) Testosterone

The hormone that is absolutely necessary for ovulation to occur is a) 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 ovary to produce a matured egg.

2. This phase also stimulates the production of estrogen which prepares the uterus for pregnancy.

3. The surge in estrogen levels triggers the release of luteinizing hormone (LH).

4. The spike in LH levels causes the matured egg to be released from the ovary, a process known as ovulation.

5. If fertilization does not occur, the luteal phase begins where the egg disintegrates and the levels of estrogen and progesterone decrease.

6. This decrease in hormone levels triggers menstruation, and the cycle begins anew.

So, the correct answer is a) Luteinizing hormone.