Select what is not true of intestinal villi among followings.

Options

A. they possess microvilli
B. they increase the surface area
C. they are supplied with capillaries and the lacteal vessels
D. they only participate in digestion of fats

Explanation

**Step-by-Step Solution:**

1. **Understanding Intestinal Villi**: Intestinal villi are small, finger-like projections found in the lining of the small intestine. Their primary function is to increase the surface area for absorption.

2. **Structure of Villi**: Each villus contains numerous blood capillaries and lymphatic vessels (lacteals). The presence of these structures is essential for the absorption of nutrients into the bloodstream.

3. **Microvilli**: In addition to villi, the surface of each villus is covered with even smaller projections called microvilli. These further increase the absorptive surface area.

4. **Function of Villi**: The main role of the intestinal villi is absorption. They help in absorbing various nutrients such as water, minerals, salts, amino acids, and vitamins.

5. **Identifying the False Statement**: The question asks for the statement that is not true about intestinal villi. Among the options provided, one states that villi only participate in the digestion of fats. This is incorrect because villi do not participate in the digestion of fats; instead, they are involved in the absorption of nutrients.

6. **Conclusion**: The statement that intestinal villi "only participate in the digestion of fats" is not true. Therefore, the correct answer is option 4.