First of all how to find which version of mono android xamarin-visual studio linking? in the project properties I can find only fields like attached in image.
Second, How to change the target mono version?
By default I see that
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Data.dll
v1 is linked. (Copied path from properties page of reference).