Definition: You are given a question on high school psychology. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Which of the following is a hallucination?
(A)thinking you are President of the United States (B)being sure that your boss is out to get you (C)thinking this is 2010 (D)hearing voices that are not actually there

D