class_docstr: Questions Only.
class_docstr_tok: ["Questions","Only","."]
code: def get_label_key(self) -> str:
      return "question"
  
imports: from typing import Optional
  from parlai.core.params import ParlaiParser
  import csv
  import os
  from abc import ABC, abstractmethod
  from PIL import Image
  from typing import List, Dict, Any
  from parlai.core.build_data import download_multiprocess
  from parlai.core.params import Opt
  from parlai.core.teachers import AbstractImageTeacher
  from parlai.utils.io import PathManager
  import parlai.utils.typing
label_desc: Use image node_id 1 for calling the QuestionOnlyTeacher obj's underlying member method code with example usage: obj.get_label_key() and returns: str