Final answer:
A wheelchair would be categorized under Orthopedics because it is related to mobility aids for musculoskeletal support.
Step-by-step explanation:
A medical assistant would find a wheelchair listed in the category of Orthopedics. Wheelchairs are typically categorized under medical supplies or durable medical equipment (DME), which are often associated with orthopedics because they aid in mobility and support for individuals with musculoskeletal conditions.