Audio options on Blu-ray movies

[Canuck31]

Hey. I didn't know whether to place this in this section or the blu-ray movies section. I'm just curious about something. So I was just watching the movie Batman (1989) and the audio selections put DD 5.1 as the first option and Dolby TrueHD 5.1 as the second option followed by other language options. I've noticed this on other blu-rays as well like the Dark Knight trilogy and Pirates of the Caribbean movies. So when I play the movie I'm just playing DD 5.1 instead of DolbyHD or DTS-HD. I don't realize this until later on in the movie if I select "display" on my remote to check remaining time. I have a Sony BDP-5500 player. Is there a way to set my player so that HD audio is the default?? My receiver is a Yamaha HTR-6063 which is HD audio compatible. Thanks for any assistance.