system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Gas shadow in heart and great vessels appears in-
assistant
The correct answer is  Ans. is 'a' i.e., IUD o In intrauterine death (IUD), there is gas in great vessels and chambers of heart - Robert's Sign.