Name the ancestor of human which is described as a man with ape brain.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of an ancestor of humans that is described as a "man with ape brain."

2. **Identifying the Relationship**: Humans and apes are closely related and share a common ancestor. This indicates that there is a specific species that exhibits characteristics of both humans and apes.

3. **Researching the Ancestor**: The ancestor that fits the description of having both human-like features and an ape-like brain is known in the scientific community.

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