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 In an outbreak of cholera in a village of 2000 population 20 cases have occurred and 5 have died. Case fatality rate is ? and explain in detail?
Ans. is `d' i.e., 25%