<prompt> A child with schizophrenia was on medications. Suddenly he developed neck stiffness and spasm. Best treatment of such a case is?BenzatropineLorazepamDiphenhydraminePropranolol  <response>: Ans. a BenzatropineRef. Handbook of psychiatric drug therapy by Lawrence A. Labbate, Maurizio favay Jerrold F. Rosenbaum, George W. Arana 6th ed. 37y Medical toxicology edited by Richard C. Dart 3th ed. 869 