I assign having multiple textbooks for a single class, both of which give conflicting information on the same topic.
Example: my take-home contemporary art history midterm asks who started a certain kind of art-making.
Textbook One says that two men 'pioneered' it in like 1951.
Textbook Two says that a third man was 'the real originator,' and he did it between WWI and his death in 1948.
So if two men pioneered it but a different man was the real originator, which guy do I write down on my very important test as being the correct answer to the question?