This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Weight in Kg is - \nSelect and explain. \nA. Normal variable, B. Discrete variable, C. Confounding variable, D. Continuous variable', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]