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 World health day - and explain in detail?
The constitution came into force on 7 th April 1948 which is celebrated every year as "world health Day ".A world health day theme is chosen each year to focus attention on a specific aspect of public health (refer pgno:919 park 23rd edition)