He figured it was some kind of joke. He had seen the cleaning lady lots of times around the school. He could even describe her: tall, dark-haired, in her 50s, but he had no idea what her name was.
As he handed his exam in, with the last question still blank, he asked the professor if that question really counted toward their grades.
“Absolutely,” the professor replied. “You’ll meet many people during your careers. All of them are significant. They deserve your attention and care, even if all you do is smile and say ‘hello.’”