Organic acid first, produced through fermentation is

Options

A. Propionic acid
B. Lactic acid
C. Citric acid
D. Oxalic acid

Answer

To solve the question "Organic acid first produced through fermentation is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Fermentation**: Fermentation is a metabolic process that occurs in the absence of oxygen (anaerobic respiration). It involves the conversion of sugars (like glucose) into acids, gases, or alcohol.

2. **Identify the Process**: In the context of fermentation, glucose is typically the substrate that is broken down to produce energy. The specific type of fermentation can lead to different products.

3. **Recognize the Role of Microorganisms**: Certain bacteria are involved in the fermentation process. For example, the bacterium *Lactobacillus vulgaricus* is known for its role in lactic acid fermentation.

4. **Determine the Products of Fermentation**: Different types of fermentation yield different organic acids. The options given are:
- a) Propanoic acid
- b) Lactic acid
- c) Citric acid
- d) Oxalic acid

5. **Identify the First Organic Acid Produced**: Among these options, lactic acid is produced first during the fermentation process, specifically through the action of *Lactobacillus vulgaricus* on glucose.

6. **Conclude the Answer**: Therefore, the first organic acid produced through fermentation is **lactic acid** (Option b).

### Final Answer:
The organic acid first produced through fermentation is **lactic acid**.