What is the name of the most popular restaurant serving Asian foods in San Francisco?
the most popular refers to max(review); Asian food refers to food_type = 'asian'; San Francisco refers to city = 'san francisco'
SELECT label FROM generalinfo WHERE food_type = 'asian' AND city = 'san francisco' AND review = ( SELECT MAX(review) FROM generalinfo WHERE food_type = 'asian' AND city = 'san francisco' )