which one is a carbohydrate?

Options

A. Inulin
B. Raphide
C. Aleurone
D. Cystolith

Answer

To determine which option is a carbohydrate, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Carbohydrates**:
- Carbohydrates are organic compounds that consist of carbon, hydrogen, and oxygen, typically in a ratio of 1:2:1. They are primarily known as sugar molecules and can be classified into simple sugars (monosaccharides) and complex carbohydrates (polysaccharides).

2. **Analyzing the Options**:
- **Option A: Inulin**
- Inulin is a type of carbohydrate. It is a starchy substance found in various plants, particularly in fruits and vegetables. It is classified as a fructan, which is a polymer of fructose.

- **Option B: Repite**
- Repite refers to crystals made of calcium oxalate. Since it is not a sugar molecule and is composed of calcium oxalate, it is not a carbohydrate.

- **Option C: Allurone**
- Allurone is a type of protein granule found in seeds. It is not a carbohydrate, as it is primarily composed of proteins.

- **Option D: Systoleth**
- Systoleth is an epidermal growth made of calcium carbonate. Like repite, it is not a carbohydrate as it does not consist of sugar molecules.

3. **Conclusion**:
- After analyzing all options, we find that the only carbohydrate among the options is **Inulin (Option A)**. Therefore, the correct answer to the question "which one is a carbohydrate?" is **Inulin**.

### Final Answer:
**Inulin (Option A) is a carbohydrate.**

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