Social & Preventive Medicine If we ask the patient attending OPD to evaluate his pain on a scale of 0 (no pain) to 5 (the worst pain), then this commonly applied scale is a A Dichotomous B Ratio scale C Continuous D Nominal 💡 Explanation If we ask the patient attending OPD to evaluate his pain on a scale of 0 (no pain) to 5 (the worst pain), then this commonly applied scale is a ✓ Correct Answer: B. Ratio scale