Please answer the following question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Some consider storyboards and wordless novels to be comics. Film studios, especially in animation, often use sequences of images as guides for film sequences. These storyboards are not intended as an end product and are rarely seen by the public. Wordless novels are books which use sequences of captionless images to deliver a narrative."?
A:
What genre are wordless novels?