Quinella at Belmont?

[joeydb]

Going through results charts over the last couple of weeks. I noticed that sometimes there was a quinella offered, and other times not.

I am just curious - does anybody know what the rules or guidelines are for when that wager is offered? I know that I'd rather play exactas anyway, and I am not on site at Belmont so I don't even know if a quinella would be available through simulcast.