You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Patients suffering from which of the following disease as per ICD/DSM criteria are eligible for disability benefit as per the National Trust Act? and explain in detail?
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.