17. The computer program product of claim 16 , wherein the first threshold comprises one of: (i) a difference between the confidence score value of the second candidate answer and the first confidence score value of the first candidate answer, (ii) a difference between a confidence score threshold for a first confidence tier of a plurality of confidence tiers and the first confidence score value, and (iii) a difference between the first confidence score value and a minimum confidence score value, wherein the minimum confidence score value is associated with a minimum confidence tier of the plurality of confidence tiers.
17. The computer program product of claim 16 , wherein the first threshold comprises one of: (i) a difference between the confidence score value of the second candidate answer and the first confidence score value of the first candidate answer, (ii) a difference between a confidence score threshold for a first confidence tier of a plurality of confidence tiers and the first confidence score value, and (iii) a difference between the first confidence score value and a minimum confidence score value, wherein the minimum confidence score value is associated with a minimum confidence tier of the plurality of confidence tiers. 18. The computer program product of claim 17 , wherein the second threshold comprises a difference between the confidence score threshold for a second confidence tier of the plurality of confidence tiers and the second confidence score value.