<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 15-year-old man presents with his father to the urgent care with 5 days of frequent diarrhea, occasionally with streaks of blood mixed in. Stool cultures are pending, but preliminary stool samples demonstrate fecal leukocytes and erythrocytes. His vital signs are as follows: blood pressure is 12683 mm Hg, heart rate is 97min, and respiratory rate is 15min. He is started on outpatient therapy for presumed Shigella infection. Which of the following is the most appropriate therapy?? A: IV erythromycin, B: Oral metronidazole, C: Oral vancomycin, D: Oral doxycycline, E: Oral TMP-SMX,  <response>: This is a clinical case of a 15-year-old male presenting with diarrhea and some blood in stool for 5 days. Stool studies show leukocytes and RBCs, indicating inflammation and bleeding, likely infectious in origin. Vital signs are normal. The description is most consistent with bacterial dysentery, likely from Shigella given the bloody diarrhea. The question asks about the most appropriate outpatient oral antibiotic therapy for presumed Shigella infection.E: Oral TMP-SMX 