This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle, Subject name: Physiology
[{'content': 'Least useful for a 800-m run in a competitive event would be \nSelect and explain. \nA. Oxidative phosphorylation, B. Pale muscle fibres, C. Lohmann reaction, D. Muscle glycogen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 800-m run would be over in about 2 min, and it would need a quick burst of activity of the muscle rather than a slow and sustained activity for prolonged periods. Option A: Oxidative phosphorylation generates ATPs in a slow and sustained manner for a low-intensity muscular activity that continues for prolonged periods (e.g., marathon). It will be the least useful of the energy systems for a sho-time event like 800-m run. Option C: LOHMANN REACTION: CREATINE PHOSPHATE - ADP - ATP - UTILIZED For such sho-duration intense muscular activity, pale fibers are more useful as they generate quick ATPs anaerobic glycolysis, using muscle glycogen as the source. Thus, options B and D are useful.', 'role': 'assistant'}]