This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Characteristic symptoms of catatonic schizophrenia is 
Select and explain. 
A. Stuptor, B. Rigidity, C. Negativism, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: D i.e. All of the above