Indigestible carbohydrate, which is also a constituent of our diet, is

Options

A. Cellulose
B. Galactose
C. Maltose
D. Starch

Explanation

To solve the question about the indigestible carbohydrate that is a constituent of our diet, we can follow these steps:

### Step 1: Understand the Question
The question asks for an indigestible carbohydrate that is part of our diet. We need to identify a carbohydrate that fits this description.

**Hint:** Look for carbohydrates that are known to be part of our diet but are not digestible by human enzymes.

### Step 2: Identify Types of Carbohydrates
Carbohydrates can be classified into simple sugars (monosaccharides and disaccharides) and complex carbohydrates (polysaccharides). Among complex carbohydrates, some are digestible while others are not.

**Hint:** Consider the different types of carbohydrates and their digestibility.

### Step 3: Focus on Indigestible Carbohydrates
Among the complex carbohydrates, one that is commonly known to be indigestible is cellulose. Cellulose is a polysaccharide made up of glucose units, but humans lack the enzyme cellulase, which is required to break it down.

**Hint:** Think about plant-based carbohydrates that humans consume but cannot digest.

### Step 4: Confirm Cellulose as the Answer
Cellulose is a major component of the cell wall in plants and is found in many fruits, vegetables, and whole grains. It is often referred to as dietary fiber. Since it cannot be digested by human enzymes, it passes through the digestive system largely intact.

**Hint:** Remember that dietary fiber is important for digestive health, even though it is indigestible.

### Conclusion
The indigestible carbohydrate that is a constituent of our diet is **cellulose**.

**Final Answer:** Cellulose