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': 'Gas in great vessels of foetus indicate- \nSelect and explain. \nA. Fetal distress, B. Post mature fetus, C. Fetal death, D. Premature fetus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Gas in great vessels and chambers of heart ( Robert's sign) is seen in maceration, which is a sign of dead born.", 'role': 'assistant'}]