Choose the correct statements regarding frog's anatomy:

A. Hepatic portal system is the special venous connection between liver and intestine.

B. There are twelve pairs of cranial nerves arising from the brain.

C. The ureters and oviducts open separately into the cloaca in female frogs.

D. Hind-brain consists of cerebellum, medulla oblongata and optic lobes.

E. Sinus venosus joins the right atrium of heart.

Choose the correct answer from the options given below:

Question

Choose the correct statements regarding frog's anatomy:

A. Hepatic portal system is the special venous connection between liver and intestine.

B. There are twelve pairs of cranial nerves arising from the brain.

C. The ureters and oviducts open separately into the cloaca in female frogs.

D. Hind-brain consists of cerebellum, medulla oblongata and optic lobes.

E. Sinus venosus joins the right atrium of heart.

Choose the correct answer from the options given below:

Accepted Answer

D. 1. We need to check each statement one by one against the known anatomy of a frog.

2. **Statement A**: The **hepatic portal system** is indeed the special venous connection that carries blood between the liver and intestine, so this statement is **correct**.

3. **Statement B**: Frogs have only **10 pairs** of cranial nerves, not twelve (twelve pairs is a mammalian feature), so this statement is **incorrect**.

4. **Statement C**: In female frogs, the **ureters** (carrying excretory waste) and the **oviducts** (carrying eggs) are separate ducts that open independently into the cloaca, so this statement is **correct**.

5. **Statement D**: The **hind-brain** actually consists of the **cerebellum and medulla oblongata** only; the **optic lobes** belong to the **mid-brain**, so this statement is **incorrect**.

6. **Statement E**: The **sinus venosus** is a thin-walled triangular sac that collects deoxygenated blood and opens into the **right atrium** of the heart, so this statement is **correct**.

7. Since A, C, and E are the correct statements, they match option D.

Hence, the answer is **D (A, C and E only)**.