This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Forensic Medicine
[{'content': 'Earliest sign of putrefaction is \nSelect and explain. \nA. Discoloration over face, B. Marbled appearance, C. Discoloration of limbs, D. Discoloration in right iliac fossa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Discoloration in right iliac fossa# The first external sign of putrefaction in a body lying in air is usually a greenish discoloration of the skin over the region of the caecum, which lies fairly superficially, and where the contents of the bowel are more fluid and full of bacteria.> Internally, putrefaction is seen on the undersurface of the liver, where that organ is in contact with the transverse colon.> The color results from the conversion of hemoglobin of blood into sulphonate haemoglobin by the hydrogen sulphide formed in large intestine and escaping into the surrounding tissues.', 'role': 'assistant'}]