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': 'There is a population of 20000 people with mean hemoglobin being 13.5 gm% having a normal distribution. What proportion of the population constitutes proportion of more than 13.5 gm%? \nSelect and explain. \nA. 0.25, B. 0.5, C. 1, D. 0.34', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In a normal distribution, 50% of values lie above mean (or Median or Mode).', 'role': 'assistant'}]