This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms & Signs , Subject name: Psychiatry
[{'content': 'An 8 year old child after tonsillectomy sees a bear in her room. She screams in fright. A nurse who rushes in switches on the light, finds a rug wrapped on an armchair. She pacifies the child. What the child experienced was a: \nSelect and explain. \nA. Delusion, B. Illusion, C. Hallucination, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B ref: Ahuja, 4th/e p. 13 and 5th/e p. 253', 'role': 'assistant'}]