I'm trying to extract free-text answer submitted by workers of Amazon Mechanical Turk using the boto library.

```
assignments = conn.get_assignments(hit_id)
for assignment in assignments:
    worker = assignment.WorkerId
    answer = assignment.Answer

```

Here I expect answer to be a free-text string (the only thing that the HIT asks workers to submit) submitted by a worker, however, the code above doesn't give me that. What am I missing here?