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': 'Differentiating features of contusion (Vs postmoem staining) are: \nSelect and explain. \nA. Bluish in color, B. Disappear on pressure area, C. Margin irregular, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Margin irregular', 'role': 'assistant'}]