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': "Association can be measured by all of the following except- \nSelect and explain. \nA. Correlation coefficient, B. cronbach's alpha, C. P value, D. Odds ratio", 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]