This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle, Subject name: Physiology
Which receptors are blocked in Myasthenia Gravis? 
Select and explain. 
A. Ach receptor, B. Ca++ receptors, C. Na+ receptors, D. Opioid receptors
A: Ach receptor
Answer: A: Ach receptor 
Explanation: Auto-antibodies destroy some of the Nicotinic acetylcholine receptors and bind others to neighbouring receptors, triggering their removal by endocytosis.