Answer:
The patient's medical history is the best source to start the investigation for the Parkinson's disease.
Step-by-step explanation:
- There is no any exact diagnosis technique for the Parkinson's disease, which is a neurological disorder disease.
- Doctor diagnose this disorder by thoroughly examining the patients medial history, sign, symptoms and physical reference.
- No blood test or any scans are available that will show the presence of this neurological disorder.
- Although MRI, CT, ultrasound of the brain can be the leading test for Parkinson's disease presence to be assured.