This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Successful treatment of chancroid is when \nSelect and explain. \nA. Symptomatic improvement occurs within 1 week., B. Objective improvement occurs within 1 week., C. Symptomatic improvement occurs within 2 weeks., D. Objective improvement occurs within 2 weeks.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Successful treatment of chancroid leads to symptomatic improvement in 3 days, and objective evidence of improvement within 1 week.', 'role': 'assistant'}]