Read the following question and then pick a category that describes the question.
Question: What sport features slotbacks , tailbacks , and touchbacks ?
What category is the question in? Choose one from Abbreviation, Entity, Description and abstract concept, Human being, Location, Numeric value. Respond with only the category and no additional text.
Entity
Description and abstract concept. (The question is asking for a description of a sport that includes certain terms, but those terms are not entities or locations,