question: Which company was a Mexican art director 's country of nationality
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ^ns:people.person.nationality ?x1 .
  ?x0 a ns:business.employer .
  ?x1 a ns:film.film_art_director .
  ?x1 ns:people.person.nationality ns:m.0b90_r
  }