This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Post moem staining before death can occur in \nSelect and explain. \nA. Cholera, B. Old age, C. Children, D. Hanging', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Postmoem hypostasis is seen before death in cases of cholera, uremia, plague, morphine, etc Ref: researchgate.net', 'role': 'assistant'}]