Analyze the relationship between 'American Girl' and 'doll' within the context of the input sentence.
Options: owned by, distribution format, employer, product/material produced

The new boutiques will also include a selection of popular doll accessories and Dress Like Your Doll ™ girl-sized clothing, plus a variety of American Girl’s best-selling books , the 2015 Girl of the Year movie , and American Girl ® magazine —all available in Spanish.
product/material produced