Which of the following hormone stimulates milk production and secretion and participates in control of reproduction ?

Options

A. Oxytocin
B. Prolactin
C. HCG
D. Dopamine

Answer

To determine which hormone stimulates milk production and secretion and participates in the control of reproduction, we can analyze the options provided:

1. **Oxytocin**: This hormone is primarily known for its role in childbirth. It helps in stimulating uterine contractions during labor and is also involved in the milk ejection reflex during breastfeeding. However, it does not directly stimulate milk production.

2. **Prolactin**: This hormone is produced by the anterior pituitary gland and is specifically responsible for stimulating milk production (lactation) in the mammary glands. It plays a crucial role in the reproductive system by promoting lactation after childbirth.

3. **HCG (Human Chorionic Gonadotropin)**: This hormone is produced during pregnancy and is important for maintaining the corpus luteum, which in turn supports the early stages of pregnancy. It does not have a role in milk production.

4. **Dopamine**: While dopamine is a neurotransmitter that plays various roles in the brain and body, it is not involved in milk production or secretion.

Based on this analysis, the hormone that stimulates milk production and secretion and participates in the control of reproduction is **Prolactin**.

### Step-by-Step Solution:
1. Identify the hormones listed in the question.
2. Analyze the function of each hormone:
- Oxytocin: Involved in childbirth and milk ejection, but not production.
- Prolactin: Stimulates milk production and secretion.
- HCG: Supports early pregnancy, not related to milk production.
- Dopamine: A neurotransmitter, not related to milk production.
3. Conclude that Prolactin is the correct answer as it directly stimulates milk production.