I believe the correct initials are PhD
https://en.wikipedia.org/wiki/Doctor_of_Philosophy

And the original deflection was stating that Saudi Arabia is not diverse, because it does not treat its foreign workers properly. My response involved sarcasm, which requires a higher understanding of the English language.

As for history, I am sure that my knowledge of Asian or Indian history far outweighs yours. Physics isn't my university subject, but engineering is.