In a frog, the hepatic portal vein is formed by

Gastric, intestinal and splenic veins

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Gastric, renal and hepatic veins

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Gastric, sciatic and subclavian veins

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Gastric, femoral and anterior abdominal

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Solution

The correct option is A Gastric, intestinal and splenic veins
The blood vessels (veins) bringing blood form various organs of digestive system (stomach, duodenum, illiums, rectum, pancreas and spleen etc) combine to form a large vein. This is known as hepatic portal vein. Near the liver a branch of abdominal vein combines with it. Then it enters the liver and divides and redivides to form capillaries.

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