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': 'Vacuum extraction is CONTRAINDICATED in: March 2013 \nSelect and explain. \nA. Premature babies, B. Hea disease, C. Microcephaly, D. Polyhydramnios', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Premature babies', 'role': 'assistant'}]