Pick the odd one out with respect to raw materials of photosynthesis.
`CO_2`,`O_2` Water, Chlorophyll

Explanation

To solve the question of identifying the odd one out with respect to the raw materials of photosynthesis, we can follow these steps:

### Step 1: Understand the process of photosynthesis
Photosynthesis is the process by which green plants use sunlight to synthesize foods (mainly glucose) from carbon dioxide and water. This process occurs in the presence of chlorophyll, the green pigment in plants.

**Hint:** Recall the basic definition of photosynthesis and its purpose.

### Step 2: Identify the raw materials of photosynthesis
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