What are the official languages of the country where you can find the city with the least population?
official language refers to IsOfficial = 'T'; least population refers to MIN(Population);
SELECT T2.Language FROM City AS T1 INNER JOIN CountryLanguage AS T2 ON T1.CountryCode = T2.CountryCode WHERE T2.IsOfficial = 'T' ORDER BY T1.Population ASC LIMIT 1