Choice A rationale:

"Treatment primarily involves surgery." This statement is incorrect.

Surgery is not the primary treatment for osteoarthritis.

Surgery may be considered in severe cases when conservative treatments are ineffective, but it is not the primary approach.

Choice B rationale:

"There are no effective treatments for osteoarthritis." This statement is entirely inaccurate.

There are various effective treatments available for osteoarthritis, including medications, physical therapy, and lifestyle modifications.

This choice is misleading and provides incorrect information.

Choice C rationale:

"Medications, physical therapy, and weight management are part of the treatment plan." This is the correct choice.

It accurately describes the primary components of osteoarthritis treatment, which often include medications for pain and inflammation, physical therapy to improve joint function, and weight management to reduce excess stress on joints.

Choice D rationale:

"Treatment mainly focuses on avoiding any physical activity to rest the joints." This statement is incorrect and not a recommended approach.

While rest and joint protection are important, completely avoiding physical activity is not the standard treatment for osteoarthritis.

Controlled and appropriate physical activity is encouraged.