Diabetes mellitus is caused from a deficiency of …………… .

Explanation

To solve the question "Diabetes mellitus is caused from a deficiency of ……………", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Diabetes Mellitus**:
- Diabetes mellitus is a metabolic disorder characterized by high blood sugar levels over a prolonged period.

2. **Identifying the Cause**:
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