Name the hormone which is released from Ovary, Placenta and assists in dilation of cervix, parturition:

Options

A. Oxytocin
B. Relaxin
C. Progesterone
D. Luteinizing hormone

Explanation

To answer the question, we need to identify the hormone that is released from the ovary and placenta, and that plays a role in the dilation of the cervix and parturition (the act of giving birth).

### Step-by-Step Solution:

1. **Identify the Hormones Related to the Ovary and Placenta**:
- The ovaries and placenta produce several hormones during pregnancy. Key hormones include estrogen, progesterone, and relaxin.

2. **Understand the Role of Each Hormone**:
- **Estrogen**: Increases during pregnancy and helps in the growth of the uterus and the development of the fetus.
- **Progesterone**: Maintains pregnancy and prevents uterine contractions.
- **Relaxin**: Specifically helps in relaxing the pelvic ligaments and dilating the cervix.

3. **Focus on Dilation of the Cervix and Parturition**:
- Dilation of the cervix is crucial for childbirth. The hormone that specifically assists in this process is relaxin, which helps to soften and widen the cervix in preparation for delivery.

4. **Conclusion**:
- Based on the functions of these hormones, the hormone that is released from the ovary and placenta and assists in dilation of the cervix and parturition is **relaxin**.

### Final Answer:
The hormone is **relaxin**.

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