**Core Concept**
A cholagogue is a substance that stimulates the contraction of the gallbladder and the release of bile into the small intestine. This process is essential for the digestion and absorption of fats and fat-soluble vitamins.

**Why the Correct Answer is Right**
The correct answer is a substance that increases the secretion of bile from the liver into the bile ducts, which then contracts the gallbladder to release bile into the small intestine. This process is mediated by the hormone cholecystokinin (CCK), which is released from the duodenum in response to the presence of fat and proteins.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly stimulate the contraction of the gallbladder or the release of bile.
**Option B:** This option is incorrect because it is a substance that inhibits the contraction of the gallbladder, rather than stimulating it.
**Option C:** This option is incorrect because it is a substance that is involved in the absorption of glucose, rather than the contraction of the gallbladder.

**Clinical Pearl / High-Yield Fact**
The hormone cholecystokinin (CCK) is released from the duodenum in response to the presence of fat and proteins, and stimulates the contraction of the gallbladder and the release of bile into the small intestine.

**Correct Answer:** C. CCK is a potent cholagogue that stimulates the contraction of the gallbladder and the release of bile into the small intestine.