Display value (Col A) based upon first unique in Col B

Hi,

I’m looking for help with this problem.
The goal is to …
1. display the instance of a value in Col A in Col C but only …

2. with the appearance of the first, unique instance of a value in Col B associated with Col A

For example: (trying to create Col C list)

ID value Col C
34 green 34
34 green
34 red 34
34 red
35 blue 35
35 green 35
35 blue