This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Advanced Fetal Ultrasonography and Therapy, Subject name: Radiology
[{'content': 'Earliest detectable congenital malformation by USG is? \nSelect and explain. \nA. Spina bifida, B. Cystic hygroma, C. Anencephaly, D. Encephalocele', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e. AnencephalyWe could not get any adequate reference but there's no doubt about the answer. If anyone has adequate reference, please mail us at reviewofaiimspgmee.com.", 'role': 'assistant'}]