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: Pediatrics
[{'content': 'Hydrops fetalis may be caused by the following, except? \nSelect and explain. \nA. Congenital hea block, B. Cystic hygroma, C. Congenital varicella syndrome, D. Congenital nephrosis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Congenital varicella syndrome", 'role': 'assistant'}]