### Database Schema:
CREATE TABLE location (
	LocationID	INTEGER	NULL	PRIMARY KEY,
	Country	TEXT	NULL,
	State	TEXT	NULL,
	StateCode	TEXT	NULL,
	City	TEXT	NULL
);

CREATE TABLE user (
	UserID	TEXT	NULL	PRIMARY KEY,
	Gender	TEXT	NULL
);

CREATE TABLE twitter (
	TweetID	TEXT	NULL	PRIMARY KEY,
	Weekday	TEXT	NULL,
	Hour	INTEGER	NULL,
	Day	INTEGER	NULL,
	Lang	TEXT	NULL,
	IsReshare	TEXT	NULL,
	Reach	INTEGER	NULL,
	RetweetCount	INTEGER	NULL,
	Likes	INTEGER	NULL,
	Klout	INTEGER	NULL,
	Sentiment	REAL	NULL,
	text	TEXT	NULL,
	LocationID	INTEGER	NULL,
	UserID	TEXT	NULL,
	foreign key (LocationID) references location (LocationID),
	foreign key (UserID) references user (UserID)
);

### User's Query:
What is the gender of the user who has posted the tweet that is seen by the most number of unique users?

### Extra Knowledge:
seen by the most number of unique users refers to Max(Reach)
SELECT T2.Gender FROM twitter AS T1 INNER JOIN user AS T2 ON T1.UserID = T2.UserID ORDER BY T1.Reach DESC LIMIT 1