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\*.

who is the secretary of state of usa
Rex Tillerson

when was the dubai metro green line opened to public
September 2011 (

who sings the song on star trek enterprise

Russell Watson