How many animals in the list given below are triploblastic, bilaterally symmetrical and pseudocoelomate?
Ascaris, facsiola, Ancylostoma, Taenia, Neries, Wuchereria, Pheretima

Options

A. Two
B. Three
C. Four
D. Five

Answer

To determine how many animals from the given list are triploblastic, bilaterally symmetrical, and pseudocoelomate, we can analyze each animal based on these criteria.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Triploblastic**: Animals with three germ layers (ectoderm, mesoderm, endoderm).
- **Bilaterally Symmetrical**: Animals that can be divided into two equal halves along one plane.
- **Pseudocoelomate**: Animals that have a body cavity (coelom) that is not fully lined by mesoderm.

2. **Analyzing Each Animal**:
- **Ascaris**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: Yes
- **Fasciola**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: No (it is acoelomate).
- **Ancylostoma**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: Yes
- **Taenia**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: No (it is acoelomate).
- **Nereis**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: No (it is coelomate).
- **Wuchereria**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: Yes
- **Pheretima**:
- Triploblastic: Yes
- Bilaterally symmetrical: Yes
- Pseudocoelomate: No (it is coelomate).

3. **Counting the Qualifying Animals**:
- Ascaris: Yes
- Fasciola: No
- Ancylostoma: Yes
- Taenia: No
- Nereis: No
- Wuchereria: Yes
- Pheretima: No

The animals that meet all three criteria are:
- Ascaris
- Ancylostoma
- Wuchereria

4. **Final Count**:
- Total animals that are triploblastic, bilaterally symmetrical, and pseudocoelomate: **3** (Ascaris, Ancylostoma, Wuchereria).

### Answer:
**3 animals** in the list are triploblastic, bilaterally symmetrical, and pseudocoelomate.