This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'The threshold of hemoglobin A1c for Diagnosis of Ove diabetes in Pregnancy? \nSelect and explain. \nA. 6%, B. 6.50%, C. 7%, D. 7.50%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diagnosis of Ove Diabetes in PregnancyMeasure of GlycemiaThresholdFasting plasma glucoseAt least 126mg/dlHemoglobin A1cAt least 6.5%Random plasma glucoseAt least 200mg/dl plus confirmationRef: William&;s Obstetrics; 24th edition; Chapter 57', 'role': 'assistant'}]