Which dropdown menu am I referring to? Any of them.
The paradox of choice is that the more choices we are given, the less likely we are to decide. When your customer is presented with a dropdown menu that has dozens of choices, she is unlikely to scan through all the choices available and will either choose nothing or choose something that isn’t really appropriate.
For example, if on your name prefix dropdown menu you offer 20 choices (I’ve seen this with my clients!), most customers will choose the prefix that is closest (e.g,. if they are a Monsignor and come across Mr. first, they may just choose that to be done with it all!).
So when you’re setting up a dropdown menu in your database, keep in mind that less is better. If you can keep it to seven choice or fewer, you’ll be in good shape.