This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Myasthenia Gravis and Muscular dystrophy, Subject name: Medicine
Nerve conduction is normal but flaccidity is seen in? 
Select and explain. 
A. M gravis, B. GBS, C. Transverse myelitis, D. Traumatic neuritis
A: M gravis
Answer: A: M gravis 
Explanation: OPTION A - Problem in NMJ d/t improper functioning of ACH receptor, so nerves aren't damaged. Neuromuscular junction is affected leading to muscle weakness. OPTION B - Demyelination of peripheral Nerves OPTION C & D - They are related to inflammation of nerves In B, C & D the nerve conduction is always abnormal