from the way the hand was played, u were probably asking whether or not you should raise the river. the villain bet so little on the river that there is very little chance he has a 4 and is probably a donkish blocking bet w/ a weaker queen. but most players w/ a queen won't call a raise there so i think you should just flat call. plus, if he actually does have a donkishly played 4, u will save money.