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Which of the following is an example of a prosthesis?

  1. An artificial arm to replace an arm that has been lost

  2. A cast to support a fractured leg

  3. A sling to support an injured arm

  4. Orthopedic shoes for foot support

The correct answer is: An artificial arm to replace an arm that has been lost

A prosthesis is an artificial device that replaces a body part that is missing or has been lost due to injury or disease. In this case, an artificial arm to replace a lost arm is a perfect example of a prosthesis. Options B, C, and D do not fit the definition of a prosthesis as they are not artificial devices used to replace a missing body part.