Succus entericus is referred to as:

Succus entericus, also known as intestinal juice, is the clear, slightly alkaline fluid secreted by the lining of the small intestine.

It contains various enzymes (such as maltase, sucrase, lactase, peptidases) and mucus that aid in the final stages of digestion and absorption of nutrients.

The term “succus entericus” specifically refers to this intestinal secretion, distinguishing it from:

• Gastric juice – the acidic secretion of the stomach.
• Chyme – the partially digested, semi‑liquid mass that results from mixing food with gastric juice.
• Pancreatic juice – the alkaline secretion from the pancreas.

Therefore, the correct choice that matches the definition of succus entericus is Intestinal juice.