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: who sings the hell song in the south park movie

SOLUTION: Metallica lead singer James Hetfield

PROBLEM: what channel is sky sports action on virgin

SOLUTION: 517: Sky Sports Action

PROBLEM: who proposed the modern model of the solar system

SOLUTION:
Victor Safronov