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: Gynaecology & Obstetrics
The earliest and most conclusive sign of intrauterine fetal death is / sure sign of IUD is: 
Select and explain. 
A. Spalding sign, B. Intrafetal gas in areas of great vessels and hea, C. Crowding of ribs, D. Hyperflexion of spine
B: Intrafetal gas in areas of great vessels and hea
Answer: B: Intrafetal gas in areas of great vessels and hea 
Explanation: Intrafetal gas in areas of great vessels and hea