Identify the incorrect statement about frog.

Options

A. (a) Parathyroid and pineal body are present
B. (b) There are ten cranial nerves only
C. (c) Optic lobes are situated in the mid brain
D. (d) The ventricle opens into the conus arteriosus

Explanation

To identify the incorrect statement about frogs, we will analyze each of the given statements one by one.

### Step-by-Step Solution:

1. **Read the Statements**: We have four statements regarding frogs. We need to evaluate each one to find the incorrect one.

2. **Evaluate Statement A**:
- Statement A claims that "parathyroid and pineal body are present."
- This statement is incorrect because frogs do not have a parathyroid gland or a pineal body.
- **Conclusion**: Statement A is incorrect.

3. **Evaluate Statement B**:
- Statement B states that "there are ten cranial nerves only."
- This statement is correct. Frogs have ten pairs of cranial nerves that arise from the brain.
- **Conclusion**: Statement B is correct.

4. **Evaluate Statement C**:
- Statement C claims that "optic lobes are situated in the midbrain."
- This statement is also correct. The optic lobes are indeed located in the midbrain of frogs.
- **Conclusion**: Statement C is correct.

5. **Evaluate Statement D**:
- Statement D states that "the ventricle opens into the conus arteriosus."
- This statement is correct. In a frog's heart, the ventricle does open into the conus arteriosus.
- **Conclusion**: Statement D is correct.

6. **Final Conclusion**:
- After evaluating all statements, we find that the only incorrect statement is Statement A. Therefore, the answer is:
- **Correct Answer**: Option A.