question:  Which of these is not true about the helmet the young boy wears?
context: "He's gone completely hay-wire. Nobody's been able to get near him for three weeks, and now at six o'clock this morning he decides he's leaving the Farm. "Full psi precautions?" asked Dorffman. The first was from Roberts Bros., announcing another shift of deadline on the book, and demanding the galley proofs two weeks earlier than scheduled. As director of psionic research at the Hoffman Medical Center, he had long since learned how administrative detail could suck up daytime hours. "A Theory of Psionic Influence on Infant and Child Development." And they would find it a light shining brightly in the darkness, a guide to the men who were floundering in the jungle of a strange and baffling new science. They were trying to study phenomena which made no sense, observing things that defied logic. Natural laws came crashing down about their ears as they stood sadly by and watched things happen which natural law said could never happen. And the more they struggled, the thicker and more impenetrable the bramble bush became— But now David Lessing had discovered a pathway through that jungle, a theory to work by— At his elbow the intercom buzzed. "I think you'd better wait before you do that," Melrose said sharply, "because I'm planning to take you apart at the Conference next month unless I like everything I see and hear down here today. "I want to hear this fairy tale you're about to publish in the name of 'Theory'," Melrose said. But mostly, I want to see just what in psionic hell you're so busy making yourself an Authority about." "As for our 'fairy tale', we happen to have a staggering body of evidence that says that it's true." "If the papers you've already published are a preview, we think it's false as Satan." "So far, we haven't found any way to set up logical controls," said Melrose. "We haven't been energetic enough to find an orthodox approach that got us anywhere.
output:  He chose to wear it because he knows it's good for him
options:  It is entirely made of plastic  He chose to wear it because he knows it's good for him  It is for the protection of adults as much as the boy  It makes him feel trapped while wearing it