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': 'All of the following affect the equilibrium in HardyWeinberg’s law, except \nSelect and explain. \nA. Small population, B. Random mating, C. Mutations, D. Gene outflow', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]