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: Forensic Medicine
[{'content': 'Abortion stick used in criminal abortion causes abortion by the mechanism of - \nSelect and explain. \nA. Uterine contraction, B. Stimulation of uterine nerves, C. Uterine infection & necrosis, D. Placental separation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Abortion stick used in criminal abortion causes abortion by uterine contraction.', 'role': 'assistant'}]