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: Physiology
Muscle weakness may be a feature of all of the following EXCEPT: March 2013 
Select and explain. 
A. Progressive degeneration of muscle fibres, B. Magnesium deficiency, C. Myasthenia gravis, D. Physostigmine therapy
D: Physostigmine therapy
Answer: D: Physostigmine therapy 
Explanation: Ans. D i.e. Physostigmine therapyNeuromuscular junction can be stimulated by some drugs like neostigmine, physostigmine and di-iso-propyl-fluoro-phosphate.