<prompt> Painful lockjaw is seen in case of following EXCEPT?TetanyTemporo-mandibular joint abscessMandibular abscessOdontogenic pulp abscess  <response>: Ans. a TetanyRef: Harrison 18th ed.352 Painful lock jaw is related to inflammation of anatomical structures of jaw and surrounding structures. Tetanus is characterized by release of tetano-spasmin toxin which causes painful muscle spasm and lockjaw. However in the question the choice A is Tetany Hypocalcemia where either Chvostek sign and Carpo- pedal spasm is seen. 