A client insists that government agents are monitoring their every move and controlling their thoughts, despite clear evidence to the contrary. What thought process is the patient currently experiencing?

Rationale: A. A delusion is a fixed, false belief that is not based in reality and is resistant to logic or contrary evidence. In this case, the client is demonstrating a paranoid delusion involving control and surveillance. B. Thought blocking is a sudden interruption in speech or thought, often seen in schizophrenia, but not characterized by false beliefs. C. Word salad is incoherent, disorganized speech with no logical connection between words—unlike this client's coherent but delusional content. D. Flight of ideas is a rapid shift from one topic to another, often seen in mania, not fixed false beliefs.