<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 85-year-old man presents with the reappearance of his Parkinsons disease PD symptoms over the last few months. He says he has been treated with various drugs over the last 20 years, but that currently his symptoms worsen as he nears the time for his next dose of medication. His movements have been slower lately and its difficult to initiate voluntary movements. His past medical history is significant for hypertension. He was diagnosed 10 years ago and was well-managed on medication. His current medications are levodopacarbidopa, rasagiline, aspirin, and captopril. The vital signs include: pulse 70min, respiratory rate 15min, blood pressure 13076 mm Hg, and temperature 36.7C 98.1F. Physical examination reveals the expected pill-rolling resting tremor, which is alleviated by movement. Increased tone of arm muscles and resistance to passive movement at the joints is noted. When asked to walk across the room, he has difficulty taking the 1st step and has a stooped posture and takes short, shuffling, rapid steps. Laboratory studies show:Serum glucose fasting 97 mgdLSodium 141 mEqLPotassium 4.0 mEqLChloride 100 mEqLCholesterol total 190 mgdLHDL-cholesterol 42 mgdLLDL-cholesterol 70 mgdLTriglycerides 184 mgdLThe patient is started on a drug that increases the efficacy of his current anti-PD medication. Which of the following is most likely the drug that was added to this patients current regimen?? A: Benztropine, B: Selegiline, C: Atorvastatin, D: Entacapone, E: Bromocriptine,  <response>: This is a clinical case about an 85-year-old man with Parkinsons disease whose symptoms are worsening and becoming difficult to control with his current medication regimen. He is experiencing typical motor symptoms of PD including resting tremor, rigidity, bradykinesia, and stooped posture. The question asks which additional medication was most likely added to improve his symptom control. The choices provided are all medications that can be used in Parkinsons disease. Benztropine is an anticholinergic medication used to treat tremor in PD. Selegiline is a MAO-B inhibitor used as monotherapy or adjunctive therapy in PD. Atorvastatin is a statin drug used to lower cholesterol and would not directly treat his PD symptoms. Entacapone is a COMT inhibitor that can be added to levodopa therapy to extend its effects and reduce wearing-off fluctuations. Bromocriptine is a dopamine agonist that could be added to treat PD, but is less likely to be added in this case where the main issue is wearing-off on his current levodopa therapy.Based on the clinical presentation of worsening motor function as the levodopa dose wears off, the most likely medication added would be entacapone to prolong the effects of levodopa and reduce motor fluctuations.D: Entacapone 