T28 it is only a waste of time for those smart enough to already know everything about stalling (and that's not me - I did get some new info out of it).
The OP is clearly a newbie who was asked a question but could not find an answer. Now, if he has been paying attention, he has quite a few credible answers to offer to his inquisitor. And hopefully enough knowledge to set his inquisitor right if he is full of sh!t. As are so many instructors, it seems.
Unfortunately, some wise-guys here proffered light-hearted (at least I hope it was) comment about the left wing being closer to the ground in a stall and how that must be avoided at all costs, how the down-going wing always stalls first (really?), cows getting bigger then smaller then bigger etc.
When justified, I am all for taking the p!ss, but spare genuine newbies with legitimate questions, please.