Find the 5-star business in Ahwatukee, AZ and identify it's business category.
5-star refers to stars = 5; in Ahwatukee refers to city = 'Ahwatukee'; business category refers to category_name
SELECT T1.business_id, T3.category_name FROM Business AS T1 INNER JOIN Business_Categories AS T2 ON T1.business_id = T2.business_id INNER JOIN Categories AS T3 ON T2.category_id = T3.category_id WHERE T1.city = 'Ahwatukee' AND T1.stars = 5