GRE Logical Reading: ETS-GRE逻辑单题ETS - 3K7ULEAT4QI00B0MJ$

Which of the following, if true, most seriously challenges the prediction? A. Coughing, a symptom of influenza that the new medication suppresses, is a primary mechanism in the spread of this illness. B. Some medications that are used to suppress symptoms of influenza are also used by many people to treat symptoms that are caused not by influenza but by other illnesses. C. Many workers who now remain at home when infected with influenza do so because the symptoms of influenza prevent them from performing their jobs effectively. D. Most adults who are immunized against influenza in order to avoid being infected are over 65 years old and retired and thus do not work outside the home. E. Symptoms of an illness are often the body's means of curing itself of the illness, and therefore suppression of symptoms can prolong the illness that causes them.