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': 'Which of the following tests are used to screen for gestational diabetes in a 22 year old primigravida? \nSelect and explain. \nA. Oral glucose tolerance test, B. Fasting blood sugar, C. Glycocyalted hemoglobin measurement, D. Random glucose challenge', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glucose challenge test (GCT) is commonly used in screening for gestational diabetes. No special preparation is needed for this test. Fifty grams of oral glucose is given between 24-28 weeks of gestation irrespective of the time or the meal and blood glucose is determined 1 hour later. A plasma value of 140 mg/dl is considered significant to perform the confirmatory diagnostic test. Ref: Essential of Obstetrics By Arulkumaran, 2004, Page 149 ; Dutta, 6th ed, Page 285', 'role': 'assistant'}]