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': 'Which of the following is not sexually transmitted : \nSelect and explain. \nA. Echinococcus, B. Candida, C. Molluscum contagiosum, D. Group B. Streptococcus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Echinococcus', 'role': 'assistant'}]