Size of common Roundworm or Ascaris lumbricoides is

Options

A. 15-30 cm in male and 20-40 cm in female
B. 10-15 cm in male and 15-25 cm in female
C. 5-10 cm in male and 10-15 cm in female
D. 3-5 cm in male and 7-10 cm in female

Answer

### Step-by-Step Solution:

1. **Understanding the Organism**:
- The common roundworm is scientifically known as *Ascaris lumbricoides*. It is a type of nematode and is a well-known intestinal parasite.

2. **Identifying the Size**:
- The size of *Ascaris lumbricoides* varies between males and females. It is important to note that the male and female roundworms have different lengths.

3. **Male Size**:
- The average length of a male *Ascaris lumbricoides* ranges from 15 to 30 centimeters.

4. **Female Size**:
- The average length of a female *Ascaris lumbricoides* ranges from 30 to 40 centimeters.

5. **Conclusion**:
- Therefore, the sizes can be summarized as:
- Male: 15 to 30 cm
- Female: 30 to 40 cm

6. **Correct Option**:
- Based on the sizes provided, the correct option is the one that states the male size as 15 to 30 cm and the female size as 30 to 40 cm.