`Xoverset(GnRH)rarrYoverset(LH)rarrZ`
The glands which are represented as X, Y and Z are

Options

A. Pituitary gland, ovary and testis, respectively
B. Hypothalamus, adrenal gland and liver, respectively
C. Hypothalamus, pituitary gland and testis/ovary, respectively
D. Pituitary gland, thyroid gland and parathyroid gland, respectively

Answer

To solve the question regarding the glands represented as X, Y, and Z in the hormonal pathway involving GnRH and LH, we can break it down step by step:

### Step-by-Step Solution:

1. **Identify GnRH**:
- GnRH stands for Gonadotropin-Releasing Hormone. It is a hormone that is crucial for the regulation of the reproductive system.
- **Hint**: Remember that GnRH is released from a specific part of the brain.

2. **Determine the source of GnRH**:
- GnRH is produced and released by the hypothalamus.
- Therefore, gland X is the **hypothalamus**.
- **Hint**: Think about where hormones that regulate the pituitary gland originate.

3. **Identify the next hormone in the pathway**:
- The next hormone mentioned is LH, which stands for Luteinizing Hormone.
- **Hint**: Consider which gland responds to GnRH by releasing LH.

4. **Determine the source of LH**:
- LH is produced and secreted by the anterior lobe of the pituitary gland, which is stimulated by GnRH from the hypothalamus.
- Therefore, gland Y is the **pituitary gland**.
- **Hint**: Recall the structure of the pituitary gland and its lobes.

5. **Identify the target of LH**:
- LH acts on the gonads, which are the reproductive organs. In females, this is the ovaries, and in males, it is the testes.
- Therefore, gland Z represents the **gonads** (ovaries in females and testes in males).
- **Hint**: Think about the organs responsible for producing gametes.

### Final Answer:
- X is the **hypothalamus**.
- Y is the **pituitary gland**.
- Z is the **gonads** (ovaries/testes).

### Summary:
The glands represented as X, Y, and Z are:
- X: Hypothalamus
- Y: Pituitary Gland
- Z: Gonads (Ovaries/Testes)