The pregnancy test is based on detection of which hormone ?

Options

A. Progesterone
B. Estrogen
C. HCG
D. LH

Answer

To answer the question "The pregnancy test is based on detection of which hormone?", let's analyze the options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which hormone is detected in pregnancy tests. Pregnancy tests are designed to determine if a woman is pregnant by identifying specific hormones in her body.

2. **Evaluating the Options**:
- **Option 1: Progesterone**: This hormone is crucial for maintaining pregnancy, but it is not the hormone primarily detected in pregnancy tests. Therefore, this option is incorrect.

- **Option 2: Estrogen**: This hormone plays a significant role in regulating the menstrual cycle and is not specifically used to confirm pregnancy. Thus, this option is also incorrect.

- **Option 3: Human Chorionic Gonadotropin (hCG)**: This hormone is produced by the placenta shortly after the embryo attaches to the uterine lining. Pregnancy tests detect hCG in urine or blood, making this the correct answer.

- **Option 4: Luteinizing Hormone (LH)**: This hormone is involved in regulating the menstrual cycle and ovulation but is not used to confirm pregnancy. Therefore, this option is incorrect.

3. **Conclusion**: The hormone that pregnancy tests are based on for detection is **Human Chorionic Gonadotropin (hCG)**.

### Final Answer:
The pregnancy test is based on the detection of **Human Chorionic Gonadotropin (hCG)**.