Forminator Conditional For Select

I would like to make my select fields be relative if member Select City A on one option he won’t be able to select this on a second field, so this will never happen:

https://cdn.livechat-static.com/api/file/lc/att/8801096/ee4d6824b8f688f46991750860836e9b/Annotation%202020-01-03%20232107.png

Can you help me?