What gender of users posted the most tweets in `en`?
"en" is the language and refers to Lang = 'en'; most tweet in 'en' refers to Max(Count(text where Lang = 'en'))
SELECT T.Gender FROM ( SELECT T2.Gender, COUNT( text) AS num FROM twitter AS T1 INNER JOIN user AS T2 ON T1.UserID = T2.UserID WHERE T1.Lang = 'en' GROUP BY T2.Gender ) T ORDER BY T.num DESC LIMIT 1
CREATE TABLE location
(
    LocationID INTEGER
        constraint location_pk
            primary key,
    Country    TEXT,
    State      TEXT,
    StateCode  TEXT,
    City       TEXT
);
CREATE TABLE user
(
    UserID TEXT
        constraint user_pk
            primary key,
    Gender TEXT
);
CREATE TABLE twitter
(
    TweetID         TEXT
            primary key,
    Weekday         TEXT,
    Hour         INTEGER,
    Day          INTEGER,
    Lang         TEXT,
    IsReshare    TEXT,
    Reach        INTEGER,
    RetweetCount INTEGER,
    Likes        INTEGER,
    Klout        INTEGER,
    Sentiment    REAL,
    "text"         TEXT,
    LocationID   INTEGER,
    UserID       TEXT,
    foreign key (LocationID) references location(LocationID),
    foreign key (UserID) references user(UserID)
);
