This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of the female genital tract, Subject name: Gynaecology & Obstetrics
[{'content': 'A 25-year-old G1P0 delivers a 33 week infant vaginally. The delivery is uncomplicated. If the obstetrician wishes to optimize the outcome for the infant, the cord should be clamped \nSelect and explain. \nA. Immediately, B. Between 30 and 60 seconds, C. After 60 seconds, D. Leave the cord unclamped until delivery of the placenta', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Delayed cord clamping of between 30 and 60 seconds is beneficial for pre term infants due to increasing total iron stores and hemoglobin levels, and decreasing the risk of intraventricular hemorrhage in the infants. Immediate bih outcomes such as Apgar scores, umbilical cord pH , or respiratory distress is unaffected by the timing of cord clamping. Delayed cord clamping also improves iron stores in term infants, but may also lead to a higher risk of hyperbilirubinemia.', 'role': 'assistant'}]