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': 'In a decomposed body the first sign seen is : \nSelect and explain. \nA. Greenish dislocation of skin over right iliac fossa, B. Greenish dislocation of skin over left iliac fossa, C. Purplish black dislocation on face, D. Purplish black dislocation over lower extremity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Greenish discolouration of Right iliac fossa', 'role': 'assistant'}]