Among the crimes in the ward with the most population, how many of them are cases of domestic violence?
most population refers to Max(Population); domestic violence refers to domestic = 'TRUE'
SELECT COUNT(T1.ward_no) AS num FROM Ward AS T1 INNER JOIN Crime AS T2 ON T1.ward_no = T2.ward_no WHERE T2.domestic = 'TRUE' ORDER BY T1.Population = ( SELECT Population FROM Ward ORDER BY Population DESC LIMIT 1 )