All of the following are features of Parkinson’s disease, except
**Core Concept**
Parkinson's disease is a neurodegenerative disorder characterized by the loss of **dopaminergic neurons** in the **substantia nigra**, leading to a deficiency of **dopamine** in the **basal ganglia**. This results in a range of motor and non-motor symptoms. The disease is primarily associated with **bradykinesia**, **rigidity**, **tremors**, and **postural instability**.
**Why the Correct Answer is Right**
Since the actual options are not provided, let's discuss the general approach to identifying the correct answer. Typically, the correct answer would be a feature that is not commonly associated with Parkinson's disease, such as **suppressed reflexes** or **increased muscle tone with normal reflexes**. In contrast, features like **resting tremors**, **cogwheel rigidity**, and **shuffling gait** are classic signs of the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it described a classic symptom of Parkinson's disease, such as **tremors** or **bradykinesia**.
**Option B:** Might be incorrect if it mentioned **rigidity** or **postural instability**, both of which are hallmarks of the disease.
**Option C:** Could be incorrect if it referred to **anosmia** or **depression**, which are non-motor symptoms of Parkinson's disease.
**Option D:** Would be incorrect if it described **dementia** or **orthostatic hypotension**, which can also be associated with the disease.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that Parkinson's disease is characterized by a significant loss of **dopaminergic neurons** in the **substantia nigra**, which leads to the classic motor symptoms of the disease. Early diagnosis and treatment can significantly improve quality of life.
**Correct Answer:**