As advances in medical research and technology have improved the ability of the medical profession to diagnose and treat a wide variety of illnesses and injuries, life spans have increased and overall health has improved. Yet, over the past few decades there has been a steady and significant increase in the rate of serious infections. Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above?
A: Modern treatments for many otherwise fatal illnesses increase the patient's susceptibility to infection.
B: It remains true that doctors sometimes prescribe ineffective medications due to misdiagnosis.
C: Life spans have increased precisely because overall health has improved.
D: As a population increases in size, there is a directly proportional increase in the number of serious infections.
Choose A, B, C or D as your solution.
A