This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
Patients suffering from which of the following disease as per ICD/DSM criteria are eligible for disability benefit as per National Trust Act? 
Select and explain. 
A. Schizophrenia, B. Bipolar disorder, C. Dementia, D. Mental retardation
D: Mental retardation
Answer: D: Mental retardation 
Explanation: The National Trust Act is applicable for autism, cerebral palsy, mental retardation and multiple disabilities.