One day you wake with a sore throat

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GENERAL KNOWLEDGE

244. One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

A.  Having waited a day, it is too late to take an antibiotic
B.  You need an antiseptic, not an antibiotic
C.  You need to be vaccinated instead of taking an antibiotic
D.  You are infected by a virus