A list of the unlisted procedures for use in a specific section of the CPT manual is contained in:
Guidelines
I'd say the answer is A. As a form of proof that the product does what it claims to do by providing evidence.
The ends of the femur are covered in a smooth, slippery substance called articular cartilage. This cartilage protects and cushions the bone when you bend and straighten your knee. The normal anatomy of the knee.
Cardiac muscle, skeletal muscle, smooth muscle.
Neurons send messages from the brain to the rest of the body
