Anti-NMDA receptor encephalitis presents with amnesia and behavioral disturbance often exceeding psychosis, along with seizures and autonomic instability; it commonly occurs in young adults, especially women, and is frequently associated with ovarian teratoma.

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Anti-NMDA receptor encephalitis shows a mix of neuropsychiatric symptoms with marked cognitive change, seizures, and autonomic instability. The best description among the options is amnesia and behavioral disturbance with autonomic instability and seizures because it captures the full spectrum: memory problems, behavioral/psychotic-like changes, plus the autonomic dysfunction and seizures that commonly accompany the illness. The other choices are too limited: focusing only on amnesia with psychosis misses the autonomic symptoms and seizures; describing seizures without movement disorders ignores the broader clinical picture; and claiming pure amnesia leaves out the behavioral and autonomic features that define this condition.