input: 
  def extract_specific_information(response_object: response, info_type: str) -> List[str]:
      """
      Extract specific information from the search results using the provided response object.
      The info_type can be one of the following: 'titles', 'creators', 'subjects', etc.
      The function should return a list of all instances that match the specified info_type.
  
      >>> response_object = response(record_data, sru_instance)
      >>> extract_specific_information(response_object, 'titles')
      ['Title 1', 'Title 2']
      >>> extract_specific_information(response_object, 'creators')
      ['Creator 1', 'Creator 2']
      >>> extract_specific_information(response_object, 'subjects')
      ['Subject 1', 'Subject 2']
      """
  
output:     info_list = []
      for record in response_object.record_data:
          if info_type in record:
              info_list.extend(record[info_type])
      return info_list