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Which of the following is not a requirement for an accessible washroom in a residential building?

  1. Grab bars

  2. Barrier-free entrance

  3. Sink with knee clearance

  4. Bathtub with built-in seat

The correct answer is: Bathtub with built-in seat

A requirement for an accessible washroom in a residential building would include grab bars, a barrier-free entrance, and a sink with knee clearance. A bathtub with a built-in seat is not a requirement as it may still be difficult for some individuals with limited mobility to access and use. Other requirements for an accessible washroom could include a wider entrance door, lever door handles, and a raised toilet seat.