In which region can you find the highest number of Baskin Robbins restaurants?
the highest number refers to max(count(city)); Baskin Robbins restaurant refers to label = 'baskin robbins'
SELECT T2.region AS num FROM generalinfo AS T1 INNER JOIN geographic AS T2 ON T1.city = T2.city WHERE T1.label = 'baskin robbins' GROUP BY T2.region ORDER BY COUNT(T1.city) DESC LIMIT 1