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Which specialty deals with synovial fluid?

  1. Ultrasonic cleaners

  2. Orthopedics

  3. Retractors

  4. Gelpi

The correct answer is: Orthopedics

Orthopedics is the correct answer because this specialty deals with the musculoskeletal system, which includes joints and synovial fluid. Synovial fluid is a viscous fluid found in the cavities of synovial joints, acting as a lubricant to reduce friction between the articular cartilage of synovial joints during movement. Ultrasonic cleaners, retractors, and Gelpi instruments do not specifically deal with synovial fluid or the musculoskeletal system like orthopedics does.