FM, a 75 -year-old man, has been treated for Parkinson's disease for the past 5 years. He has been taking L-dopa (Figure 1) / carbidopa (Figure 2) plus am antadine (Figure 3), but has been experiencing decreased function, cog-w heel rigidity, and renewed onset of hypokinesia. At the last clinic visit, FM was placed on reserpine (Figure 4 ) and a diuretic as an approach to treating his hypertension. 0 ver the last 6 weeks, he has had decreased mobility and increased mental status changes, which can be attributed to the medication additions. 1. What is the main cause of Parkinson's disease? How does it managed? 2. Outline what you think the problems are with the management of FM. 3. Propose a solution or an approach to therapy and defend your approach briefly, but clearly