For the root beer brand with the most 5 star ratings, what is the name of the brewery?
most 5 star ratings refers to MAX(COUNT(StarRating = 5)); name of the brewery refers to BreweryName;
SELECT T1.BreweryName FROM rootbeerbrand AS T1 INNER JOIN rootbeerreview AS T2 ON T1.BrandID = T2.BrandID WHERE T2.StarRating = 5 GROUP BY T1.BrandID ORDER BY COUNT(T2.StarRating) DESC LIMIT 1