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': 'Which of the following is a pre-requistic for the Chi square test to compare- \nSelect and explain. \nA. Both sample should be mutually exclusive, B. Both sample need not be mutually exclusive, C. Normal distribution, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]