Schistosoma is

Options

A. hermaphrodite but protandrous
B. Hermaphrodute but protogynous
C. Unisexual
D. Hermaphordite with self fertillzation

Answer

### Step-by-Step Solution:

1. **Understanding Schistosoma**: Schistosoma is a genus of trematodes, commonly known as blood flukes, which belong to the phylum Platyhelminthes.

2. **Reproductive Characteristics**: Unlike many other trematodes, Schistosoma exhibits dioecious or unisexual reproduction. This means that the male and female sexes are separate entities; an individual organism does not possess both male and female reproductive organs.

3. **Sexual Dimorphism**: In Schistosoma, there is a notable sexual dimorphism, where males are significantly larger than females. The male surrounds the female with a structure called the gynecophoral canal for their entire adult life.

4. **Analyzing the Options**:
- **Option A**: "Hermaphrodite but protandrous" - Incorrect, as Schistosoma is not hermaphroditic.
- **Option B**: "Hermaphrodite but protogynous" - Incorrect, for the same reason as above.
- **Option C**: "Unisexual" - Correct, as Schistosoma has separate male and female individuals.
- **Option D**: "Hermaphrodite with self-fertilization" - Incorrect, as Schistosoma does not possess both sexes in one organism.

5. **Conclusion**: The correct answer is that Schistosoma is unisexual.