This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diabetes Mellitus, Subject name: Medicine
[{'content': 'G.T.T post 1 hour sugar for gestational diabetes is >__ mg%? \nSelect and explain. \nA. 140, B. 150, C. 180, D. 200', 'role': 'user'}, {'content': 'Answer: C \nExplanation: With OGTT using 100 gm glucose 1 hour value > 180 mg % 2 hour value > 155 mg% 3 hour value > 140 mg %', 'role': 'assistant'}]