What is the question "What is Supergirl 's secret identity ?" asking about?
A: human

What is the question "What album put The Beatles on the cover of Time in 1967 ?" asking about?
A: entity

What is the question "What airport is on the Piccadilly subway line ?" asking about?
A: location

What is the question "Who was the accused in The Trial of the Century , which opened Janurary 1 , 1935 ?" asking about?
A:
human