Read the passage and answer the question below: In the world today we make health an end in itself. We have forgotten that health is really the means to enable a person to do his work and do it well. A lot of modern medicine and this includes many patients as well as many physicians pay very little attention to health but a lot of attention to those who imagine that they are ill. Our great concern with health is shown by the medical columns in newspapers. The health articles in popular magazines and the popularity of television programmers and all those books on medicine. We talk about health all the time. Yet for the most part the only result is more people with imaginary illness. The healthy man should not be wasting time talking about health: he should be using health for work. Work done makes good health possible. Modern medicine is primarily concerned with: