单选题 A patient being treated for an antisocial personality disorder insists that other nursing staff gave him lithium everyday in this time, which helped him, and he demands the current nurse get some immediately. The nurse's BEST reply to this patent would be
A．I will go and get some for you if you calm down
B．There isn't any doctor's advice for you about lithium
C．I won't believe in what you said
D．Ok, be patient please, and I'll talk to your attending doctor about whether lithium would be appropriate for you