Tip of the tongue phenomenon refers to the feeling that people can't remember things they are familiar with at ordinary times, but they can't say what they say, especially when they are nervous.
According to the above definition, which of the followings is tip of the tongue phenomenon:
Xiao Wang applied for a job in an advertising company. Facing the questions of the recruiters, he was calm and answered them like a stream, but when the recruiters finally asked him about his expected salary, he was hard to say