I need to read a specific line from my file.

My file contains these contents

<html > one </html>
<html > two </html>
<html> three</html>
I know to read the entire file using QFile,QTextStream.
But now i want to read the file which starts with <html>. Even if i use readLine() , i can read each and every line of a File. Does anybody know how to read particular line from a File ??????????