Poison secreting parotoid gland occurs in

Options

A. Ichthyophis
B. Rana
C. Bufo
D. salamandra

Answer

### Step-by-Step Solution:

1. **Identify the Glands**: The question asks about the poison-secreting parotoid gland, which is a modified gland found in certain amphibians.

2. **Understand the Function**: The parotoid gland secretes mucus and poison, specifically a type of neurotoxin. This is important for defense against predators.

3. **Recognize the Order**: The presence of parotoid glands is typically associated with amphibians in the order Anura, which includes frogs and toads.

4. **Evaluate the Options**:
- **Ichthyophis**: This is a limbless amphibian belonging to the order Gymnophiona (Apoda), which does not have parotoid glands. Therefore, this option is incorrect.
- **Rana**: This refers to frogs, specifically tree frogs. They do not possess parotoid glands. Thus, this option is also incorrect.
- **Bufo**: This is the common toad, which is known to have parotoid glands that secrete a neurotoxin called bufo-toxin. This option is correct.
- **Salamandra**: This refers to salamanders, which do not have parotoid glands. Hence, this option is incorrect.

5. **Conclusion**: Based on the analysis of the options, the correct answer is **Bufo**.

### Final Answer:
The poison-secreting parotoid gland occurs in **Bufo**.

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