Even though she has been taking lithium for a year, you review some teaching about drug therapy with S.T. Which statement by S.T. reveals a need for further education? a. "I will call my doctor if I have severe vomiting or diarrhea." b. "I need to be careful because lithium is addictive."c. "I take the lithium tablets with meals." d. I will keep my appointments to have my drug levels checked.