question: Whose comments increased racial tension in the Fall of 2015 ?
answer: Nicholas A. Christakis and his wife Erika
turker_answer: Nicholas A. Christakis 's and his wife Erika 's comments increased racial tension in the Fall of 2015 .
rule-based: Nicholas A. Christakis and his wife Erika 's increased racial tension in the Fall of 2015 .