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다음 글의 빈칸에 들어갈 말로 가장 적절한 것을 고르시오.
A nocebo effect is a bad effect caused by the belief that something is harmful although it has no effect. An experiment done by Japanese researchers proved this. They tested 57 high school boys for their sensitivity to allergens. The boys filled out questionnaires about past experiences with lacquer trees, which can cause an itchy rash. Boys who reported having severe reactions to the poisonous trees were blindfolded. Researchers brushed one arm with leaves from a lacquer tree but told the boys they were chestnut tree leaves, and rubbed the other arm with chestnut tree leaves but said they came from a lacquer tree. Surprisingly, the arm that the boys believed to have been exposed to the poisonous tree began to ____________________. In most cases the arm that had contact with the actual poison did not react.
*lacquer tree: 옻나무