Studies have shown that people who rarely take antibiotics, which are antibacterial drugs, have per immune systems than do people who take antibiotics frequently. Yet there is no evidence that taking antibiotics weakens the immune system.
Which of the following, if true, best reconciles the apparent discrepancy in the information above ？（）
A．People who have p immune systems seldom get the kinds of infections for which people normally take antibiotics.
B．People who have p immune systems are seldom aware that their immune systems are unusually p.
C．People who have weak immune systems have great difficulty recovering from bacterial infections if they do not take antibiotics.
D．Some people take antibiotics even though the antibiotics cause a variety of side effects.
E．Some people take antibiotics frequently because their doctors prescribe antibiotics for viral infections as well as for bacterial infections.
