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: Anatomy
[{'content': 'Superficial Plamar arch is related to the? \nSelect and explain. \nA. Distal end of fully extended thumb, B. Distal end of fully flexed thumb, C. Proximal end of the fully flexed thumb, D. Proximal end of fully extended thumb', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Superficial palmar arch is a direct continuation of the ulnar aery. The curve of the arch lies across the palm, in level with the distal border of the fully extended thumb. The arch is completed by anastomosing with the superficial palmar branch of the radial aery.', 'role': 'assistant'}]