Which is NOT a symptom of Parkinson's as per the TRAP mnemonic?

The correct answer, which identifies anxiety as not a symptom of Parkinson's disease according to the TRAP mnemonic, is substantiated by the fact that the TRAP mnemonic specifically stands for the hallmark motor symptoms of Parkinson's: Tremor, Rigidity, Akinesia (or bradykinesia), and Postural instability. Tremor refers to the involuntary shaking or rhythmic movement, rigidity indicates stiffness in the muscles, and akinesia pertains to the difficulty in initiating movement or overall slowness.

Anxiety, while it can occur in individuals with Parkinson’s disease, is not one of the primary motor symptoms typically highlighted by the TRAP mnemonic. It falls more under the category of non-motor symptoms that can accompany Parkinson's but is not part of the core motor symptoms defined by this acronym. Thus, anxiety does not fit within the context of the TRAP mnemonic, making it the correct choice for this question.