"No, it is my class," Loki corrected. "I can see how I might have confused you. I was flustered." In reality, he did not see, but he let the matter drop. The truth remained that he had been dizzy after chasing the papers. Marcus probably was, too. And the man had already earned points by referring to him properly. Loki had put an incredible amount of work into his PhD. More than he had put into anything before or since.
Still, Thor was eternally thought of as the "real" doctor of the family.
"This is Philosophy 101. I teach four Philosophy 101s. It's tragic."