<prompt> Agent used for eliciting diagnostic differentiation of Myasthenia Gravis from Cholinergic crisis isNeostigmineEcothiophateEdrophoniumAmbenonium  <response>: Edrophonium test Edrophonium test is used to distinguish between Myasthenic crisis of autoimmune Myasthenia Gravis and Cholinergic crisis. Edrophonium is a sho acting reversible non-carbamate Acetylcholinesterase inhibitor indirectly acting cholinomimetic. It is based on the scientific rationale that muscular weakness of myasthenic crisis caused by inadequate cholinergic stimulation dramatically improves on administration of Edrophonium. In Cholinergic crisis - caused by overeatment with anticholinesterases -- resulting in muscle weakness by induction of persistent depolarization, fuher administration of Edrophonium causes drastic worsening of muscle weakness. Ref:- Goodman Gilman Pharmacological Basis of Therapeutics 13th Ed; Pg num:- 172 