 Nasruddin, he is the guy who invented the cognitive test, the gold standard, they say. And he says that, yeah, Biden needs to take this test and he would be the guy to do it. He has been reluctant. This is from the New York Post. Dr. Zayed Nasruddin has been reluctant to comment about the president's health despite widespread concerns about the 81-year-old's slurring, stiffness and freezing episodes during his time in the White House.