This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'A routine ultrasound done at 20 weeks period of gestation done in a 31 years old gravida 1 para 0 revealed an anomaly. The patient comes to you with the following ultrasound film for a second opinion. What congenital anomaly would you explain to the couple? \nSelect and explain. \nA. Omphalocele, B. Encephalocele, C. Cystic hygroma, D. Anencephaly', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is d, i.e. AnencephalyRef. Williams 24/e, p 201The ultrasound appearance (absence of cranial vault and varying amount of brain) is classically seen in anencephaly of fetus.', 'role': 'assistant'}]