Which of the following possesses mammary glands?

Options

A. Struthio
B. Pteropus
C. Hemidactylus
D. Rana

Answer

To solve the question "Which of the following possesses mammary glands?", we will analyze the options provided and determine which one belongs to the class Mammalia, as mammary glands are a defining characteristic of mammals.

### Step-by-Step Solution:

1. **Understand the Definition of Mammary Glands**:
- Mammary glands are specialized organs in mammals that produce milk to nourish their young. This feature is unique to the class Mammalia.

2. **Identify the Options**:
- The options provided are:
- a) Struthio
- b) Pteropus
- c) Haemodactylus
- d) Rana

3. **Analyze Each Option**:
- **Option a: Struthio (Ostrich)**:
- The ostrich is a bird (class Aves) and does not possess mammary glands. Birds have feathers and hollow bones instead.

- **Option b: Pteropus (Flying Fox)**:
- The flying fox is a type of bat and belongs to the class Mammalia. As a mammal, it possesses mammary glands.

- **Option c: Haemodactylus (House Gecko)**:
- The house gecko is a reptile (class Reptilia) and does not have mammary glands. Reptiles have dry skin and lay eggs.

- **Option d: Rana (Common Frog)**:
- The common frog is an amphibian (class Amphibia) and does not possess mammary glands. Amphibians have moist skin and can live both in water and on land.

4. **Conclusion**:
- Based on the analysis, the only option that possesses mammary glands is **Option b: Pteropus (Flying Fox)**.

### Final Answer:
The correct answer is **Pteropus**.