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': 'Most common congenital anomaly associated with face presentation is : \nSelect and explain. \nA. Anencephaly, B. Hydramnios, C. Microcephaly Hydrocephalus, D. Hydrocephalus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anencephaly', 'role': 'assistant'}]