This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Errors and P-Value, Subject name: Social & Preventive Medicine
[{'content': 'In a population of 100000, hemoglobin of 100 women is estimated with standard deviation of 2gm%. What is the standard error - \nSelect and explain. \nA. 1, B. 0.1, C. 2, D. 0.2', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 0.2", 'role': 'assistant'}]