Which of the following is a common risk factor for osteoarthritis?
- A. Increasing age
- B. A viral infection
- C. Low blood pressure
- D. Excess vitamin D
Explanation
Years of use thin the cartilage and stiffen the joints, so osteoarthritis is commonest after middle age, with obesity and joint injury adding to the risk. It is a wear and tear disease, not an infection.
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