48.     Which of the following statements related to the treatment, with lithium carbonate, of person with bipolar disorder is true a)     Most will need to take lithium carbonate for an extended period of time, perhaps for life b)     Once the person’s mood becomes euthymic, treatment can be discontinued in most cases c)     Because of the need to maintain constant blood levels, long term injections are the preferred form of treatment d)     Treatment is most effective in the acute stage of the illness although some people will need long term treatment