**Core Concept**
Myasthenia Gravis (MG) is an autoimmune disease characterized by muscle weakness and fatigue, resulting from the immune system's attack on the acetylcholine receptors (AChR) at the neuromuscular junction (NMJ). This leads to impaired transmission of nerve impulses to muscles, causing muscle weakness and fatigue.

**Why the Correct Answer is Right**
The correct answer is not explicitly provided, but we can infer the correct answer based on the options given. In Myasthenia Gravis, the immune system produces antibodies that bind to the nicotinic acetylcholine receptors (nAChR) on the postsynaptic muscle membrane, leading to receptor internalization and degradation. This results in a decrease in the number of functional AChR, making it difficult for acetylcholine to bind and initiate muscle contraction.

**Why Each Wrong Option is Incorrect**
**Option A:**
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**Option B:**
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**Option C:**
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**Option D:**
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**Clinical Pearl / High-Yield Fact**
To remember the key features of Myasthenia Gravis, use the mnemonic "WEAKNESS": Worsening of symptoms with fatigue, Exhaustion, Acetylcholine receptor antibodies, Kicking in of symptoms after exercise, and Symptoms worsening with stress.

**Correct Answer:**
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