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: Social & Preventive Medicine
[{'content': 'Best site for measuring skin fold thickness \nSelect and explain. \nA. Subscapular region, B. Mid triceps, C. Abdominal region, D. Mid thighs', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]