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 issued for qualitative data? \nSelect and explain. \nA. Mean, B. Whisker plot, C. Mode, D. Histogram', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]