This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia and other psychotic disorders, Subject name: Psychiatry
Type of schizophrenia with mental retardation 
Select and explain. 
A. Von-Gosh syndrome, B. Paranoid schizophrenia, C. Catatonic schizophrenia, D. Pfropf schizophrenia
D: Pfropf schizophrenia
Answer: D: Pfropf schizophrenia 
Explanation: Pfropf schizophrenia occurring in the presence of mental retardation .it differs from schizophrenia in only that there is often a povey of ideation and delusions are not usually very well systematised.therefore behavioural disturbances are more prominent than delusions and hallucinations Ref: A sho textbook of Psychiatry. Nihal Ahuja. Edition 7. Pg no:61