docstr: Returns an identifier for the question in the given document.
docstr_tok: ["Returns","an","identifier","for","the","question","in","the","given","document","."]
code: def _question2id(self, doc):
      """Returns an identifier for the question in the given document."""
      return " ".join([doc["sentence"], doc["question"]])
  
imports: import numpy
  from collections import defaultdict
  from lm_eval.base import rf, Task
label_desc: Use image node_id 12 for calling the MCTACO obj's underlying member method code with example usage: obj._question2id(doc) and returns: str