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: Medicine
Myaesthenia gravis is associated with: 
Select and explain. 
A. Decreased acetylcholine at nerve endings, B. Decreased myosin, C. Absent troponin C, D. Decreased myoneural junction transmission
D: Decreased myoneural junction transmission
Answer: D: Decreased myoneural junction transmission 
Explanation: Answer is D (Decreased Myoneural junction transmission): The primary defect in Myaesthenia gravis is decreased transmission across the myoneural junction due to decrease in the number of Acetylcholine receptors. The fundamental defect is Myaesthenia gravis is a decrease in the number of Acetylcholine Receptors at the postsynaptic muscle membrane, which results in decreased efficiency of neuromuscular transmission' -- Harrison