MacBook HDMI to TV has no sound
I can connect my tv to my macbook pro through a HDMI cable and the picture shows up perfectly. However, the sound goes through my laptop speakers and not through the tv. When I go into Preferences --> sound --> output, there is not option to select for the hdmi, just the internal speakers. How can I get the sound to go through the tv instead?
[Re-Titled by Moderator]
MacBook Pro