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
In hydrops foetalis, on ultrasonography, the earliest sign is the development of foetal : 
Select and explain. 
A. Pericardial effusion, B. Ascites, C. Pleural effusion, D. Skin edema
D: Skin edema
Answer: D: Skin edema 
Explanation: Skin edema