If they don't have 5x or 2x in their range, and you're pretty sure they often continue to bluff, then call.If they have hands like A5, K5 in their range, 43 perhaps, A3, A4, overcards (especially if it's not a huge reraise for them to call) then reraise for value.Basically, you need a more specific situation to get an accurate answer, as it depends entirely on your opponent (and a good reason there are no "systems" that can turn you into a really good player in husngs).

This is a very good question for everybody to read, however.If you come to the conclusion that "oh it's obviously X"  (either a reraise or a call), then it is likely you have found a leak in your game and you're not adapting enough to your opponent in these situations.

Well if you are calling instead of reraising, it usually means you're either 1) very short stacked (and one scare card won't change the fact that you're too pot commited to fold usually) or 2) facing a player that will bluff quite often (again, one scare card or even two should not change your decision from call to fold vs a player that bluffs this often).So you can look at it generally and break it down and only call if you are shorter stacked (and still feel they will often bluff the turn) or if they are aggressive bluffy players.  If those don't apply, just reraise when in doubt, it's not likely to be wrong by much and usually will be the best decision.Let me know if that makes it more clear to you.