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: Physiology
[{'content': 'Venous return to hea during quiet standing is facilitated by all of the following factors, except: \nSelect and explain. \nA. Calf muscle contraction during standing, B. Valves in perforators, C. Sleeves of deep fascia, D. Gravitational increase in aerial pressure', 'role': 'user'}, {'content': "Answer: D \nExplanation: Gravitational increase in aerial pressure decrease the venous return. Ref: Srb's Manual of Surgery By Sriram Bhat, Page 188.", 'role': 'assistant'}]