Teacher: Two analogies that signify affordances are given in the form "A : B. C : ?". Affordance is the possibility of an action being done on an object, for example book is an affordance of writing. The phrase "A : B" implies that B is an affordance of A. Your task is to replace the question mark (?) with the appropriate affordance of the given action C, following the "A : B" relation. Your answer should be a single object without further explanation.
Teacher: Now, understand the problem? If you are still confused, see the following example:
cure : disease. swing : ?
Solution: sword
Reason: The given analogy implies that diseases can be cured - an affordance relation. Hence, the appropriate answer for swing is sword, since swords can be swung.

Now, solve this instance: pet : cat. brush : ?
Student:
hair