<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def answer(part, module='mlai2014.json'):
 """Returns the answers to the lab classes."""

    marks = json.load(open(os.path.join(data_directory, module), 'rb'))
    return marks['Lab '  + str(part+1)]