A Client Began Taking Lithium for the Treatment of Bipolar

A client began taking lithium for the treatment of bipolar disorder approximately 1 month ago and asks why he has gained 12 pounds since then.Which is the most appropriate nursing response?

A) "I'm surprised you have gained;weight loss is the typical pattern when taking lithium."
B) "Your weight gain is more likely related to food intake than medication."
C) "Weight gain is a common,but troubling side effect.Let's talk about some strategies for safely improving your nutrition and exercise habits."
D) "There's not much you can do about the weight gain.It's better than being emotionally unstable though."