Given below are six sets with four terms each. In each set one term is odd and cannot be grouped in the same category to which the other three belong. Identify the odd one in each set and name the category to which the remaining three belong. The first one has been done as an example.
Example: Calyx, Corolla, Stamens, Midrib
Odd term : Midrib
Category : Parts of a flower.
Oxytocin, Insulin, Prolactin, Progesterone.

Explanation

**Step-by-Step Solution:**

1. **Identify the Terms:**
The terms given are Oxytocin, Insulin, Prolactin, and Progesterone.

2. **Understand Each Term:**
- **Oxytocin:** A hormone released by the hypothalamus, involved in childbirth and breastfeeding.
- **Insulin:** A hormone that regulates blood sugar levels, produced by the pancreas.
...