Mickey is about to take his psychology final, for which he has studied very hard. Just before the exam, the person sitting next to Mickey asks him the name of the physiologist who worked on classical conditioning. Mickey suddenly realizes that he cannot quite remember the name, but he knows that it starts with a P and is two syllables long. Mickey is experiencing __________.

A) repression (motivated forgetting)
B) fatigue from information overload
C) simple decay
D) the tip-of-the-tongue phenomenon

The situation described is an example of the tip-of-the-tongue phenomenon, where a person cannot immediately recall a word or name that they know, but have a sense that they will eventually remember it. This is different from repression, as repression involves actively forgetting or blocking out a memory due to its emotional content or significance. Fatigue from information overload and simple decay are also not applicable in this scenario, as Mickey had studied very hard for his exam and the information is still relatively fresh in his memory.