Question:
Choose your answer: Is "A unique green (green appearing neither yellowish nor bluish) is produced on such a device by mixing light from the green primary with some light from the blue primary." a good answer to the question "What is produced on a computer display when light from the green primary is mixed with some light from the blue primary?"
Answer:
yes

Question:
Choose your answer: Is "Guinea-Bissau was once part of the kingdom of Gabu, as well as part of the Mali Empire." a good answer to the question "What kingdom was Guinea-Bissau once part of?"
Answer:
yes

Question:
Choose your answer: Is "In 883, he conquered the Drevlians, imposing a fur tribute on them." a good answer to the question "What year did Oleg conquer the Drevlians?"
Answer:
yes