[A]: Pinna of ear is quite elastic and pliable.
[R]: Pinna Qf ear is made up of spongy bone.

Options

A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false

Answer

### Step-by-Step Solution:

1. **Understanding Assertion (A)**: The assertion states that "Pinna of ear is quite elastic and pliable."
- This statement is **true**. The pinna, or outer ear, is primarily made of elastic cartilage, which gives it its flexibility and pliability.

2. **Understanding Reasoning (R)**: The reasoning states that "Pinna of ear is made up of spongy bone."
- This statement is **false**. The pinna is not made of bone; rather, it is composed of elastic cartilage, which is different from spongy bone. Spongy bone is found in certain areas of the body, but it does not comprise the structure of the ear pinna.

3. **Conclusion**: Since the assertion (A) is true and the reasoning (R) is false, the correct relationship is that A is true and R is false.

4. **Final Answer**: The correct option is C: A is true and R is false.