This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
[{'content': 'Risk of subsequent preterm delivery with previous two preterm deliveries at < 34 weeks is? \nSelect and explain. \nA. 15%, B. 20%, C. 30%, D. 40%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. 40%Recurrent Spontaneous Preterm BirthsAccording to Prior OutcomeBirth OutcomeSecond Birth <=34 Weeks (%)First birth >=35 weeks5First birth <=34 weeks16First and second birth <=34 weeks41', 'role': 'assistant'}]