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': "The use of combined OCP's is associated with an increased incidence of: \nSelect and explain. \nA. Bacterial vaginosis, B. Chlamydial endocervicitis, C. Vaginal warts, D. Genital herpes", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]