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
Patients suffering from which of the following disease as per ICD/DSM criteria are eligible for disability benefit as per the National Trust Act? 
Select and explain. 
A. Schizophrenia, B. Bipolar disorder, C. Dementia, D. Mental retardation
D: Mental retardation
Answer: D: Mental retardation 
Explanation: National Trust Act (1999) is an act to provide for the constitution of a body at the national level for the welfare of persons with Autism, Cerebral palsy, Mental retardation, and Multiple disabilities and for matters connected therewith or incidental thereto.