Mentors With At Least Five Mentees

Problem

You are given a DataFrame `researcher`.

```text
+-----------+-----------+--------+-----------+
| Column | Type |
+-----------+-----------+
| res_id | int |
| full_name | object |
| lab | object |
| mentor_id | int |
+-----------+-----------+
res_id is the unique key. mentor_id points to the res_id of this researcher's mentor (it may be NULL).
```

Find every researcher who personally mentors **at least five** other researchers. Return a DataFrame with a single column `full_name`. Result order does not matter.

Input data

Example rows — the live problem includes the full dataset.

Expected output

Your answer should return 1 row with the columns full_name.

Starter code (Pandas (Python))

import pandas as pd

def big_mentors(researcher: pd.DataFrame) -> pd.DataFrame:
    # Your code here
    return researcher

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