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.

Example Input: Emery boards are generally less abrasive than the metal nail files, and hence, emery boards may take longer to file down nails than metal nail files. However, nail files may play a role in disease transmission if they are used on more than one person without adequate sterilization. Emery boards are usually less expensive than metal nail files, therefore emery boards can be economically disposed of after use on a single person. The nail can be smoothed and shaped accurately by taking light, even strokes in one direction across the top of the nail. Twenty to thirty easy strokes can typically shorten excessively long fingernails, while five to ten strokes are sufficient for shaping the nails.
Example Output: what is the difference between emery board and nail file

Example Input: San Pedro River is a northward-flowing stream originating about 10 miles (16 km) south of the international border south of Sierra Vista, Arizona, in Cananea Municipality, Sonora, Mexico. The river starts at the confluence of other streams (Las Nutrias and El Sauz) just east of Sauceda, Cananea. Within Arizona, the river flows 140 miles (230 km) north through Cochise County, Pima County, Graham County, and Pinal County to its confluence with the Gila River, at Winkelman, Arizona. It is the last major, free-flowing undammed river in the American Southwest, it is of major ecological importance as it hosts two-thirds of the avian diversity in the United States, including 100 species of breeding birds and 300 species of migrating birds.
Example Output: where does the san pedro river start and end

Example Input: The Justice League is an assemblage of superheroes who join together as a team. The seven original members were Aquaman, Batman, The Flash, Green Lantern, Martian Manhunter, Superman, and Wonder Woman. The team roster has rotated throughout the years, consisting of various superheroes from the DC Universe, such as The Atom, Big Barda, Black Canary, Cyborg, Green Arrow, Elongated Man, The Flash, Green Lantern, Hawkgirl, Hawkman, Metamorpho, Plastic Man, Power Girl, Orion, Red Tornado, Stargirl, Captain Marvel / Shazam, and Zatanna, among many others.
Example Output:
who are the super heros in justice league