We know that a distinction is made between positive and negative symptoms of schizophrenia. What is the difference between these symptoms?
A. Negative symptoms indicate the presence of something normal, and positive symptoms indicate the absence of something usual.
B. Positive symptoms indicate the presence of some thing normal, the absence of something usual.
C. Negative symptoms indicate the presence of something unusual, and positive symptoms indicate the absence of something normal.
D. Positive symptoms indicate the presence of something unusual, and negative symptoms indicate the absence of something normal.
