You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Ridley's scale is used in classification of which disease? and explain in detail?
Ridley's logarithmic scale is used to grade the response to treatment in case of leprosy. Ref: Park 21st edition, page 293.