Which one of the following hormones helps in relaxation of pubic symphysis during child birth ?

Options

A. Oestrogen
B. Progesterone
C. LH
D. Relaxin

Answer

To answer the question "Which one of the following hormones helps in relaxation of pubic symphysis during childbirth?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones Listed**: The question provides four options: estrogen, progesterone, luteinizing hormone, and relaxin. We need to analyze each hormone to determine which one is responsible for the relaxation of the pubic symphysis during childbirth.

2. **Evaluate Estrogen**: Estrogen is known for its role in regulating the menstrual cycle and promoting the development of female secondary sexual characteristics. It does not play a direct role in the relaxation of the pubic symphysis during childbirth. Therefore, this option is incorrect.

3. **Evaluate Progesterone**: Progesterone is primarily responsible for maintaining pregnancy. It prepares the uterus for implantation and helps maintain the uterine lining. While it is crucial for pregnancy, it does not directly contribute to the relaxation of the pubic symphysis. Thus, this option is also incorrect.

4. **Evaluate Luteinizing Hormone (LH)**: Luteinizing hormone is involved in the regulation of the menstrual cycle and ovulation. It stimulates the production of estrogen but does not have a role in the relaxation of the pubic symphysis. Therefore, this option is incorrect as well.

5. **Evaluate Relaxin**: Relaxin is a hormone that is specifically involved in the process of childbirth. It helps to relax the pelvic ligaments and the pubic symphysis, allowing for the necessary flexibility during delivery. This makes relaxin the correct answer to the question.

### Final Answer:
The hormone that helps in the relaxation of the pubic symphysis during childbirth is **Relaxin**.

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