You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: TEENS IN BOOKS 
Clue: This 15-year-old Dutch skater is the title character of a classic book by Mary Mapes Dodge
hans brinker

Category: ELEMENT NAMES 
Clue: Found by Carl Gustav Mosander, terbium is named for Ytterby, a village in this country
sweden

Category: MODERN "TIME"S 
Clue: To own a property jointly with others & use it in common but at different times

time-share