Display one randomly in the array?

<code> $arry = array('A','B','C','D');
$result = array_rand($arry,2);
foreach ($result as $val) 
{
echo $arry["$val"].""; 
}
</code>

Excuse me, this will randomly generate 2 sets of ABCD combinations, such as BC DC AB, etc.
But what I want to display is to display only one. Randomly display A or B or C or D from the array.
How to do this?
After I changed 2 to 1, it failed