Choose the odd pair out in the following

Options

A. areolar connective tissue -collagen
B. epithelium -keratin
C. neuron - melanin
D. muscle fibre - actin

Answer

To solve the question "Choose the odd pair out in the following," we will analyze each of the given pairs to identify which one does not fit with the others.

### Step-by-Step Solution:

1. **Identify the pairs:**
- Pair 1: Areolar connective tissue - Collagen
- Pair 2: Epithelium - Keratin
- Pair 3: Neuron - Melanin
- Pair 4: Muscle fiber - Actin

2. **Analyze Pair 1: Areolar connective tissue - Collagen**
- Collagen is a protein that is a major component of areolar connective tissue. This means that collagen is derived from or is a part of areolar connective tissue.

3. **Analyze Pair 2: Epithelium - Keratin**
- Keratin is a structural protein found in the epithelial layer of the skin. It is produced by epithelial cells, making this pair related in terms of location and function.

4. **Analyze Pair 3: Neuron - Melanin**
- Melanin is a pigment produced by melanocytes, which are found in the skin and also in the brain. Although melanin is not a component of neurons, it is associated with them in terms of pigmentation.

5. **Analyze Pair 4: Muscle fiber - Actin**
- Actin is a protein that is a key component of muscle fibers. It plays a crucial role in muscle contraction and is directly associated with muscle fibers.

6. **Identify the odd pair:**
- The first pair (Areolar connective tissue - Collagen) is different from the others because collagen is a component of areolar connective tissue, while the other pairs consist of proteins that are found in specific tissues (keratin in epithelium, melanin in neurons, and actin in muscle fibers).

### Final Answer:
The odd pair out is **Areolar connective tissue - Collagen**.

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