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 used (injectable form) by prostitutes for constriction of vagina: March 2013 (d) \nSelect and explain. \nA. Strychnine, B. Cocaine, C. Dhatura, D. Aconite', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Cocaine', 'role': 'assistant'}]