This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical & Surgical Illness Complication Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Macrosomia is a result of: \nSelect and explain. \nA. Maternal hyperglycemia, B. Fetal hyperglycemia, C. Fetal hyperinsulinemia, D. Maternal hyperinsulinemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a, i.e. Maternal hyperglycemiaRef. High Risk pregnancy, Fernando Arias 4//e, p 259The basic cause of macrosomia is maternal hyperglycemia.', 'role': 'assistant'}]