The first day of 2017 year. A girl's body is found in the school. Since you are a great detective, you are under the burden of investigation. After going there you talk to some important people. That is, it is possible to investigate the incident when asked. They are Headmasters, Night Guard, Pioneer, Bangla Teacher and Girl's Best Friend. Each of you asked,
Headmaster: I was in the school office room for the whole day
Night guard: I have to wake up all night so I was sleeping during the day
Pioneer: I was arranging an office paper in accordance with the orders of Sir
Teacher of Bengal: I was giving the number of quotes for half yearly exams
Now the girl's best friend said in the voice, "I'm telling the truth that I did not come to school on that day"
The mystery is going on a lot of complexity. After a few minutes of thinking, who is the real culprit? Now tell me who is the real culprit ???