One day a dentist (牙医) was starting his morning work. Suddenly a man came in. His face was red and he could only say "Quick! Quick!" The dentist thought he must be ill. His assistant(助手)helped to make the poor man sit in a chair. The dentist gave the man some medicine to make him sleep. Then he looked into te man"s mouth and pulled out all the bad teeth. As soon as the man woke up, He said in a low voice, "Quick, doctor, quick."
"It"s all right now." The dentist told him, "I came to tell you our house is on fire."

The dentist thought the man was a patient.
[A] True.
[B] False.