This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': "In a statistical study for calculating the effect of drug on patient's sugar level the test showed significant difference when in reality there was no difference \nSelect and explain. \nA. Alpha error, B. Beta error, C. Gamma error, D. Power of a test", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed", 'role': 'assistant'}]