<prompt> Muscle weakness may be a feature of all of the following EXCEPT: March 2013Progressive degeneration of muscle fibresMagnesium deficiencyMyasthenia gravisPhysostigmine therapy  <response>: Ans. D i.e. Physostigmine therapyNeuromuscular junction can be stimulated by some drugs like neostigmine, physostigmine and di-iso-propyl-fluoro-phosphate. 