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: Pathology
Most specific test for myasthenia gravis 
Select and explain. 
A. Antibodies to Ach receptors, B. Electrophysiological studies, C. Tensilon test, D. All of the above
A: Antibodies to Ach receptors
Answer: A: Antibodies to Ach receptors 
Explanation: Autoimmune mediated neuromuscular disease is an example of type II hypersensitivity reaction.
Before 40 years of age, it is most commonly seen in women, but it occurs equally in both sexes in older patients.
Distinct finding: ↓ Ach receptors (in muscles) and circulating antibodies to Ach receptors.
Most specific test: Antibodies to Ach receptors.
Electrophysiological studies: ↓ in motor response on repeated stimulation.
Nerve conduction studies: Normal.
Treatment is done with drugs (neostigmine with atropine) and thymectomy.