Which is a fructosan?
**Core Concept**
Fructosans, also known as inulin or fructan, are a type of polysaccharide composed of fructose molecules. They are commonly found in plants, particularly in the roots and tubers of plants like chicory, artichokes, and asparagus.
**Why the Correct Answer is Right**
The correct answer is a type of fructosan because it is a polysaccharide composed of fructose molecules. Fructosans are not digestible by human enzymes, and they can act as prebiotics, feeding beneficial bacteria in the gut. The mechanism of action of fructosans involves the non-digestible oligosaccharides being fermented by bacteria in the colon, producing short-chain fatty acids, which can provide energy to the cells lining the colon.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it is not a type of fructosan. Fructosans are specific polysaccharides composed of fructose molecules, and this option does not match that definition.
* **Option B:** This option is incorrect because it is a type of disaccharide, composed of two simple sugars. Fructosans, on the other hand, are polysaccharides composed of many fructose molecules.
* **Option C:** This option is incorrect because it is a type of sugar that is commonly found in the blood. Fructose is a simple sugar, whereas fructosans are polysaccharides composed of many fructose molecules.
**Clinical Pearl / High-Yield Fact**
Fructosans have prebiotic properties, meaning they can feed beneficial bacteria in the gut, promoting a healthy gut microbiome. This can have numerous benefits for overall health, including improved digestion, boosted immune system, and even mental health benefits.
**Correct Answer: C. Fructan**