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
[{'content': 'Non-immune hydrops fetalis is due to all except : \nSelect and explain. \nA. Chromosome defect, B. Alpha thalassemia major, C. Parvo B - 19 virus, D. ABO incompatibility', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ABO incompatibility', 'role': 'assistant'}]