TASK DEFINITION: In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
PROBLEM: when was the last time the death penalty was used in the us

SOLUTION: 2018

PROBLEM: who played in the world series in 1990

SOLUTION: Cincinnati Reds

PROBLEM: who steers the boat on the river styx

SOLUTION:
Charon or Kharon