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': 'First external sign of putrefaction is: March 2004 \nSelect and explain. \nA. Marbling of skin, B. Distension of skin, C. Protrusion of tongue, D. Greenish discoloration of abdomen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Greenish discoloration of abdomen', 'role': 'assistant'}]