This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hydramnios and Oligo Hydramnios, Subject name: Gynaecology & Obstetrics
[{'content': 'Polyhydramnios not seen in - \nSelect and explain. \nA. Anencephalv, B. Renal agenesis, C. Hydropsfetalis, D. Chorioangioma of placenta', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Renal agenesis Etiology of Poivhvdrammoso Fetal anomaliesy Anencephalyy Open spina bifiday Esophageal or duodenal atresiay Facial clefts and neck massesy Hydropsfetalisy Aneuploidyo Placentay Chorioangioma of placentao Multiple pregnancyy Maternal diabetes: cardiac or renal disease.", 'role': 'assistant'}]