What chord uses only the notes F B C?

C Major 7 sus4 (C is the root, B is the major 7, F is the sus4). A would be to add a G on the 1st and 3rd string, play the C on the 5th string, the F on the 4th string, and the B on the 2nd string. The G would add a 5 to the cord which is compatible with the C maj.7.