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
Non-immune hydrops fetalis is due to all except : 
Select and explain. 
A. Chromosome defect, B. Alpha thalassemia major, C. Parvo B - 19 virus, D. ABO incompatibility
D: ABO incompatibility
Answer: D: ABO incompatibility 
Explanation: ABO incompatibility