Determine the topic of the question. Question: "when did classification of races begin?" Topic:
Ans: Race (human classification)

Determine the topic of the question. Question: "WHO IS HENRY SAMPSON JR.?" Topic:
Ans: Henry Sampson (inventor)

Determine the topic of the question. Question: "who wrote the song cocaine?" Topic:
Ans: Cocaine (song)

Determine the topic of the question. Question: "what is the organic layer in an amoled screen?" Topic:
Ans: OLED