In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

[Q]: Los Angeles County, officially the County of Los Angeles, (Spanish: Condado de Los Ángeles) is the most populous county in the United States, with more than 10 million inhabitants as of 2017. Its population is larger than that of 41 individual U.S. states. It is the third-largest metropolitan economy in the world, with a Nominal GDP of over $700 billion -- larger than the GDPs of Belgium, Saudi Arabia, Norway and Taiwan. It has 88 incorporated cities and many unincorporated areas and at 4,083 square miles (10,570 km), it is larger than the combined areas of Delaware and Rhode Island. The county is home to more than one-quarter of California residents and is one of the most ethnically diverse counties in the U.S. Its county seat, Los Angeles, is also its most populous city at about four million.
[A]: what is the difference between los angeles and los angeles county


[Q]: In humans, implantation of a fertilized ovum is most likely to occur around 9 days after ovulation, however this can range between 6 and 12 days.
[A]: when does the human embryo implant into the uterus


[Q]: The origin of the custom may be in German folklore, where in supernatural beings are thought to live in trees, and can be invoked for protection.
[A]:
where did the term knock on wood originate


