\(X \stackrel{\text { GnRH }}{\longrightarrow} \mathrm{Y} \stackrel{\text { LH }}{\longrightarrow} \mathrm{Z}\)
The glands which represented as X,Y and Z are
1. Pituitary gland, ovary and testis, respectively
2. Hypothalamus adrenal gland and liver respectively
3. Hypothalamus pituitary gland and testis/ovary respectively
4. Pituitary gland, thyroid and parathyroid gland respectively