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': 'You are conducting an autopsy of a body. Which of the following is the first internal sign of putrefaction that you are likely to observe? \nSelect and explain. \nA. Greenish discolouration of the right iliac fossa, B. Marbling, C. Discolouration of the under surface of liver, D. Liquefaction of brain', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Greenish discolouration of the right iliac fossa is the first external sign of putrefaction. It appears in about 12 - 24 hours. Marbling is most prominent after 31 - 48 hours, it is visible externally. The greenish discoloration of the under surface of the liver is the first internal sign of the putrefaction. Ref: Textbook of Forensic Medicine and Toxicology by Narayan Reddy, Edition 23, Page - 135, 136.', 'role': 'assistant'}]