In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Q: Question: 50-year-old man, mechanic, consulted for a two-year evolution of difficulty in handling the right hand and a feeling of stiffness in the arm. His wife notices his expressionless face and reports that he has very vivid nightmares that wake him up agitated. During the examination, rigidity was observed in the right limbs and slow walking without right arm. What is the most likely diagnosis?
Options: <1> Left thalamic lacunar infarct. <2> Amyotrophic Lateral Sclerosis. <3> Parkinson's disease <4> Cervical plexopathy <5> Corticobasal degeneration.
A:
3