Answer:
D)
"I've been avoiding painkillers because I know they can mask damage that I might be inflicting on my knees."
Step-by-step explanation:
bilateral osteoarthritis (OA) in his knees, is the inflammation of the knees. It results into pain of the bones and cartilages
The cause is as a result of ageing, gender, it could be hereditary.
One of the treatments for this sickness is exercise, losing of body weight to ease the load on the bones
The statement "I've been avoiding painkillers because I know they can mask damage that I might be inflicting on my knees."
will require further explanation as painkillers are needed by the patient to reduce the pain.