This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostats, Subject name: Social & Preventive Medicine
[{'content': 'Power of study can be increased by: \nSelect and explain. \nA. Increasing alpha error, B. Decreasing beta error, C. Decreasing alpha error, D. Increasing beta error', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -Power of a statistical test can be increased by: 1. Increasing the no. of subjects in a trial (sample size) 2. Reducing beta error (probability of Type II error) 3. Increasing sensitivity', 'role': 'assistant'}]