A patient who is being treated for malaria has started therapy with quinine and tetracycline. He ...

A patient who is being treated for malaria has
 
  started therapy with quinine and tetracycline. He asks the nurse why he is on an antibiotic when malaria is caused by a parasite. Which response by the nurse is correct?
  a. The tetracycline prevents reinfection by the malarial parasite.
  b. The antibiotic is combined with quinine to reduce the side effects of the quinine.
  c. An antibacterial drug prevents the occurrence of superinfection during antimalarial therapy.
  d. The two drugs are more effective against malaria when given together.