J-1 visa. Student or Scholar?

[TomSanders]

What is the name of your state (only U.S. law)? CA

J-1 visa is given to either students or scholars. So how to make the determination whether someone came to the US on a J-1 visa is a student or a scholar?

Example, Mr.A came to the US on a J-1 visa. He is mainly involved in research works as a post-doc in an university. Is he a J-1 student or a J-1 scholar?

 

[ImmigAttyLana]

There is a designation on the DS form. But what is the purpose of knowing this information?