Pelvic girdle is formed by fusion of three bones - ilium, ischium and ……………. .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the third bone that, along with the ilium and ischium, forms the pelvic girdle.

2. **Identifying the Bones**: The pelvic girdle is a ring-like structure located in the lower part of the trunk. It consists of three bones:
- **Ilium**: The largest bone of the pelvic girdle, located at the top.
- **Ischium**: The bone that forms the lower and back part of the pelvis.
- **Pubis**: The bone that forms the front part of the pelvic girdle.
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