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': 'Number of family member is a - \nSelect and explain. \nA. Qualitative variable, B. Discrete variable, C. Continuous variable, D. Categorial variable', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Discrete variable: Fixed values no intermediate values eg: no of girls, no. of children, etc. Continuous variable: can take intermediate values eg:weight, height, etc', 'role': 'assistant'}]