a. I am guessing some kind of flopped draw that improved on the turn. Second most likely type of hand I would say is top pair, that didn't want to face a semi-bluff allin from you on the flop so he waited for a safe turn card.

b. AQ/KQ, A[img]/images/graemlins/spade.gif[/img]J[img]/images/graemlins/spade.gif[/img] / K[img]/images/graemlins/spade.gif[/img]J[img]/images/graemlins/spade.gif[/img] / J[img]/images/graemlins/spade.gif[/img]T[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img]K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img]T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img]9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img]5[img]/images/graemlins/diamond.gif[/img] With maybe QJs/22/33/JJ/A[img]/images/graemlins/spade.gif[/img]x[img]/images/graemlins/spade.gif[/img]

c. Well, given he's getting alomst 2:1 on the call, he will probably call with top pair hands, and he is just barely short of the necessary odds to be calling with his super draws listed above if he thinks his outs to a TPTK+ hand are all clean. He should call with J[img]/images/graemlins/spade.gif[/img]x[img]/images/graemlins/spade.gif[/img] because if there is any chance you are bluffing this will be profitable.