<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 46-year-old woman comes to the physician because of a 3-day history of diarrhea and abdominal pain. She returned from a trip to Egypt 4 weeks ago. Her vital signs are within normal limits. There is mild tenderness in the right lower quadrant. Stool studies show occult blood and unicellular organisms with engulfed erythrocytes. Which of the following is the most appropriate initial pharmacotherapy for this patient?? A: Doxycycline, B: Metronidazole, C: Albendazole, D: Paromomycin, E: Ciprofloxacin,  <response>: This is a patient with travelers diarrhea likely caused by Entamoeba histolytica infection, given the recent travel to Egypt, diarrhea, abdominal pain, occult blood in stool, and visualization of unicellular organisms with engulfed erythrocytes on stool studies. The most appropriate initial pharmacotherapy would be an agent that treats amebiasis. Metronidazole is the first-line agent for treating invasive E. histolytica infections, such as intestinal and extraintestinal amebiasis. Doxycycline may be used as an adjunctive agent but is not first-line. Albendazole and paromomycin are used for other types of parasitic infections, not amebiasis. Ciprofloxacin is an antibiotic that may be used for bacterial diarrhea but not for parasitic infections like amebiasis.B: Metronidazole 