<prompt> Proved to be effective in the management, of Preeclampsia:ZincCalciumMagnesiumNone of the above  <response>: The drug of choice for control and prevention of convulsion in eclampsia is magnesium sulphate ,usually given by Pritchard;s regime.The mechanism of action thought to have a peripheral action at the neuromuscular junction,by competing with calcium for entry into the cells.It may also have central action. TEXT BOOK OF OBSTETRICS,Sheila Balakrishnan,2nd edition,page no.268 