Given the task definition, example input & output, solve the new input case.
In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
Example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
Output: How many books are there in the British Library?
In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input case for you: Article: Butterfly gardens can be grown throughout the United States.There is a wide variety of both butterflyattracting (nectar) plants and host plants covering climate zones throughout the country.Butterfly gardens can range in size from a few containers placed in a sunny spot to several acres. Nectarproducing plants will attract butterflies to your garden.In order to support a full butterfly life cycle,host plants (for laying eggs and used as a caterpillar food source) must also be present. Throughout the country,the general requirements for butterfly gardening are the same:full sun,nectar source plants,larval host plants,a pesticidefree environment,and knowledge of the local butterfly species.Many butterflyattracting plants are natives and require little attention,as they are naturally adapted to the region in which they live. Butterfly gardens are best planted in spring with younger plants or in fall with mature plants that will become dormant quickly and reemerge in spring.It is best not to plant in the heat of summer or the cold of winter. One of the most common mistakes in butterfly gardening is planting only one nectar source.Adult butterflies have a very short lifespan.Planting a variety of nectar sources will encourage more butterflies to visit the garden.Planting an adequate supply of host plants gives butterflies a place to lay their eggs,which will successfully hatch and result in butterflies that will continue to visit the garden. Butterflies typically lay their eggs in late spring and hatch 3-6 days after they are laid.It takes 3-4 weeks for a caterpillar to pupate and 9-14 days to emerge as an adult. Good resources for learning more about butterfly gardening include zoos,botanical gardens,butterfly houses,garden centers and nurseries,libraries and the Internet.There are many good websites dedicated to butterflies and butterfly gardening.
Answer: Butterfly gardens need to plant butterflyattracting plants only.
Output:
Which of the following is true,according to the passage?