A 12-year-old girl presents to the emergency department with a 3 day history of abdominal pain and diarrhea. Gross blood, 4 episodes of diarrhea in 12 hours. Ill after eating hamburger. Mucous membranes dry. Stool sample confirms gram negative bacilli. Which of the following would be the best treatment option?
a Ciprofloxacin
b Vancomycin
c Trimethoprim-sulfamethoxazole
d Azithromycin

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