@tbkprogrammer

The output will be:

```
(1, 2, [3, 4, 5])
```

Explanation: Although tuples are generally immutable, they can contain mutable elements like lists. Here, `a[2]` is a list, so we can modify it by appending `5`. This changes the list within the tuple, resulting in `(1, 2, [3, 4, 5])`.