in general, yes, you should use dextrose (corn sugar). table sugar (sucrose) can impart a cidery flavor (i'm not sure how much that would happen with 4 oz of it, but don't push your luck). you could also use honey, brown sugar, and others, but just go with dextrose, it's kinda the standard. in theory, you should weigh out the sugar depending on what temperature your beer was when it finished and how many volumes of CO2 you want in your carbonated beer. you can find all that info at howtobrew.com if you are interested, otherwise, the 4-5 oz should get you in the right ballpark.
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