Tomato is a natural source of which acid ?

Options

A. Acetic acid
B. Citric acid
C. Tartaric acid
D. Oxalic acid

Explanation

To determine which acid is a natural source found in tomatoes, we can analyze the options provided:

1. **Acetic Acid**: This acid is primarily found in vinegar and is not a significant component of tomatoes.

2. **Citric Acid**: This acid is commonly found in citrus fruits such as lemons and oranges, but it is also present in tomatoes in smaller amounts.

3. **Tartaric Acid**: This acid is mainly found in grapes and is not associated with tomatoes.

4. **Oxalic Acid**: This acid is found in various plants, but it is not a primary acid in tomatoes.

Now, considering the acids listed, we can conclude:

- While tomatoes contain small amounts of citric acid, they are not a major source of acetic, tartaric, or oxalic acids.

Thus, the most relevant answer to the question is **citric acid**, as tomatoes do contain it, albeit in lesser quantities compared to citrus fruits.

### Step-by-Step Solution:
1. **Identify the Acids**: List the acids mentioned in the options (acetic, citric, tartaric, oxalic).
2. **Research Each Acid**: Determine where each acid is predominantly found.
- Acetic Acid: Found in vinegar.
- Citric Acid: Found in citrus fruits and tomatoes.
- Tartaric Acid: Found in grapes.
- Oxalic Acid: Found in various plants.
3. **Analyze Tomato Composition**: Understand that tomatoes contain citric acid, making it a natural source.
4. **Select the Correct Answer**: Based on the analysis, the correct answer is citric acid.