Frog is dissected from posterior side because

Options

A. (a) it is convenient
B. (b) that side possess ventral cord
C. (c) due to abdominal vein
D. (d) posterior side is soft to cut

Answer

### Step-by-Step Solution:

1. **Understanding the Anatomy of the Frog**:
- The frog's body can be divided into different regions: anterior (head region), posterior (abdomen and lower region), dorsal (upper side), and ventral (belly side).
- Knowing these terms helps in understanding why dissection is performed from a specific side.

2. **Evaluating the Options**:
- **Option A**: "It is convenient."
- This is too vague and does not provide a biological reason for the choice of dissection side.
- **Option B**: "The side possesses ventral cord."
- This is incorrect because frogs have a dorsal vertebral column, not a ventral cord.
- **Option C**: "Due to abdominal vein."
- This option suggests that the posterior side has an abdominal vein that branches out from the liver, making it easier to observe the internal organs during dissection.
- **Option D**: "Posterior side is soft to cut."
- While the skin of the frog is moist and soft, this is true for all sides, making this option not specific enough.

3. **Identifying the Correct Answer**:
- After evaluating all options, **Option C** is the most accurate answer because it highlights the presence of the abdominal vein, which facilitates a clearer view of the internal anatomy when dissecting from the posterior side.

4. **Conclusion**:
- Therefore, the frog is dissected from the posterior side primarily due to the presence of the abdominal vein, which allows for better visibility and access to the internal organs.