How to get Sender Button Tag/Name/ID in UIImagePickerController - didFinishPickingMediaWithInfo?

How to get Sender Button Tag/Name/ID in UIImagePickerController -
didFinishPickingMediaWithInfo?

Can somebody guide me on getting the sender button Tag/Name/ID in below
method?
-(void)imagePickerController:(UIImagePickerController*)picker
didFinishPickingMediaWithInfo:(NSDictionary*)info {
// I Want to get the sender button reference here
}