This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
myasthenia gravis is a disorder of 
Select and explain. 
A. Peripheral nerve, B. Spinal cord, C. Motor neuron, D. Neuromuscular junction
D: Neuromuscular junction
Answer: D: Neuromuscular junction 
Explanation: None