A vestigial organ in man is

Options

A. Mammary gland
B. Pelvic gland
C. Vermiform appendix
D. Sebaceous glands.

Answer

To answer the question "A vestigial organ in man is," we will follow these steps:

### Step 1: Understand the concept of vestigial organs
Vestigial organs are structures in an organism that have lost most or all of their original function through the course of evolution. They are remnants of organs that were fully functional in ancestral species.

**Hint:** Remember that vestigial organs are not completely useless; they may still serve minor functions or be remnants of a more complex structure.

### Step 2: Identify examples of vestigial organs in humans
In humans, several organs are considered vestigial. Some examples include:
- Auricular muscles (muscles around the ear)
- Wisdom teeth (third molars)
- Vermiform appendix (a small pouch connected to the large intestine)
- Coccyx (tailbone)
- Body hair
- Nictitating membrane (a small fold in the corner of the eye)

**Hint:** Think about organs that seem to have little to no current function compared to their role in our ancestors.

### Step 3: Analyze the options provided
The options given in the question are:
1. Mammary gland
2. Pelvic gland
3. Vermiform appendix
4. Sebaceous gland

Among these options, we need to identify which one is a vestigial organ.

**Hint:** Consider which of these organs has lost its primary function over time.

### Step 4: Determine the correct answer
The vermiform appendix is widely recognized as a vestigial organ in humans. While it may have some minor functions related to the immune system, it is considered vestigial because it no longer serves the significant digestive function it had in herbivorous ancestors.

**Final Answer:** The vestigial organ in man is the **vermiform appendix**.

### Summary of Steps:
1. Understand what vestigial organs are.
2. Identify examples of vestigial organs in humans.
3. Analyze the options provided.
4. Determine the correct answer based on the understanding of vestigial organs.