turn out to be...

meaning:
to develop or become someone or something in the end,

to become apparent or known

 Busted prostitutes in Nanning turn out to be men

examples:

• It turned out to be rumour.
• The rookie( new player) turned out to be the team's best hitter.
• 33 Conspiracy Theories That Turned Out To Be True  
• Facebook has turned out to be the biggest social network website  all over the world. 
• In the end he's turned out to be right on almost everything. 
• iPad turns out to be big business in mobile computing.  
• Even a mistake may turn out to be the one thing necessary to a worthwhile achievement. - by Ford, Henry.