I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Slaughter High Movie plot: The day begins with popular student Carol Manning (Caroline Munro) jokingly asking school nerd Marty Rantzen (Simon Scuddamore) to have sex with her in the women's locker room. After he removes his clothes, Marty is surprisingly exposed to a group of students who tease him in several ways, including jabbing at his crotch with a javelin, giving him an electric shock, and dunking his head into a toilet bowl. This prank ends when the students's coach comes in to find out what is happening. The students are forced to perform a vigorous workout in the gymnasium. Still, two students give Marty a marijuana joint laced with poison, which he smokes in the science lab where he is working on a chemistry project. The joint makes him so sick he runs to the men's room to vomit. While he is gone, one of the popular kids named Skip rigs the experiment to explode in Marty's face. Upon Marty's return, the set up works, causing Marty to panic and a great fire to erupt in the lab after he knocks over a Bunsen burner. In the struggle, Marty accidentally bumps into a shelf where a precariously placed jug of acid sits and causing the jug to fall and break, splashing acid on Marty's face and leaving him horribly disfigured. The sound attracts the attention of the students, who stand by the door in shock. Years later, those behind the prank are mysteriously invited back to the school for a reunion. Upon arriving, they discover that the campus was closed years ago and the building is in disrepair and awaiting demolition. They begin to think that one of the former students was behind the invitations, but everyone denies it. They decide to break into the school to hang out and drink alcohol, then come across a room containing their old school lockers which, to their surprise, are filled with their old belongings. They notice Marty's old locker, and the alumni begin questioning what happened to him after the prank gone awry. Skip tells them that Marty has supposedly been kept in a mental institution. Soon, the caretaker is killed onto a... My question: who give Marty a marijuana joint laced with poison?
The answer to this question is:
two students