This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'A 38-year-old woman, G5P4, at 10 weeks with a urine culture grew >100,000 CFU/mL of Escherichia coli. She is otherwise totally asymptomatic with no complaints. Which of the following is the best next step in management of this patient? \nSelect and explain. \nA. Amoxicillin-clavulanate, B. Ciprofloxacin, C. No additional treatment or workup indicated, D. Trimethoprim-sulfamethoxazole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All pregnant patients are screened and treated for asymptomatic bacteriuria at the initial prenatal visit due to the risk of pyelonephritis, preterm bih and low bih weight associated with untreated asymptomatic bacteriuria. The most common pathogen is Escherichia coli. First-line antibiotics include cephalexin, amoxicillin-clavulanate, and nitrofurantoin', 'role': 'assistant'}]