Any rule on mucking 1 card only?

[UATrewqaz]

This is just a question that poppped into my head and I know everyone's gut re-action will be "the hand is dead" but I was wondering if anyone knew OFFICIALLY (I know house rules vary on some things) but as officially as possibly

Is it legal to muck 1 of your hole cards and still play with the other?

Example: Let's say you try to steal the blinds with A [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/heart.gif[/img] and the BB ends up calling.

Board is K [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/club.gif[/img] T [img]/images/graemlins/club.gif[/img]

BB bets into you on the river, your ace alone gives you the nuts... would it be legal to say "I call" place your chips out to call flip over the ace and then muck the other card.

You've made your intention clear (that you are calling) and you clearly have the winning hand (or at least worthy of a chop) so what's the official rule?