Name one essential amino-acid

Options

A. Methionine
B. Alanine
C. Glutamate
D. Proline

Explanation

**Step-by-Step Solution:**

1. **Understand the Concept of Essential Amino Acids:**
- Essential amino acids are those that cannot be synthesized by the human body and must be obtained from the diet.

2. **Identify the Options Provided:**
- The options given are:
- A) Methionine
- B) Alanine
- C) Glutamate
- D) Proline

3. **Evaluate Each Option:**
- **Methionine:** This is an essential amino acid, meaning it must be obtained from food.
- **Alanine:** This is a non-essential amino acid, as the body can synthesize it.
- **Glutamate:** This is also a non-essential amino acid.
- **Proline:** This is classified as a non-essential amino acid.

4. **Select the Correct Answer:**
- Since methionine is the only amino acid from the list that is essential, the answer is:
- **Answer: A) Methionine**

---