Mark the odd word in each group: RBC, WBC, platelets, cartilage

Explanation

To solve the question of marking the odd word in the group: RBC, WBC, platelets, and cartilage, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Terms**:
- We have four terms: RBC (Red Blood Cells), WBC (White Blood Cells), platelets, and cartilage.

2. **Classify the Terms**:
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