Assertion (A): Animals belongimg to phylum Porifera are often called sponges.
Reason(R): The animals have porous bodies.

Options

A. Both A and R are true and R is the correct explanation for A.
B. Both A and R are true but R is not the correct explanation for A.
C. A is true and R is false.
D. A is false and R is true.

Explanation

### Step-by-Step Solution

1. **Understanding the Assertion (A)**:
- The assertion states that animals belonging to the phylum Porifera are often referred to as sponges. This is correct because the members of this phylum are indeed commonly known as sponges.

2. **Understanding the Reason (R)**:
- The reason provided states that these animals have porous bodies. This is also correct as sponges are characterized by their porous structure, which allows water to flow through them.

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