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:

**Statement A:** “Hepatic portal system is the special venous connection between liver and intestine.”
In frogs, as in other vertebrates, blood from the intestinal tract is collected by the portal vein and delivered to the liver before returning to the systemic circulation. This unique venous pathway is called the hepatic portal system, making statement A true.

**Statement B:** “There are twelve pairs of cranial nerves arising from the brain.”
Frogs possess only ten pairs of cranial nerves (I–X). The number twelve is incorrect, so statement B is false.

**Statement C:** “The ureters and oviducts open separately into the cloaca in female frogs.”
In female anurans, the urinary tract (ureters) and the reproductive tract (oviducts) each have distinct openings that both empty into the common cloacal cavity. Therefore, statement C is true.

**Statement D:** “Hind‑brain consists of cerebellum, medulla oblongata and optic lobes.”
The optic lobes belong to the forebrain (telencephalon) in amphibians, not the hind‑brain. The hind‑brain is limited to the cerebellum, medulla oblongata, and associated structures. Hence statement D is false.

**Statement E:** “Sinus venosus joins the right atrium of heart.”
Frogs have a three‑chambered heart where the sinus venosus receives systemic venous blood and empties directly into the right atrium. This makes statement E true.

Combining the true statements gives the correct option: **A, C and E only**.