能使人保持乐观情绪的神经递质是

A．5-羟色胺

B．多巴胺

C．肾上腺素

D．乙酰胆碱

E．以上都不是

A client who has received a new prescription for oral contraceptives asks the nurse how to take them. Which of the following would the nurse instruct the client to report to her primary caregiver（）

A. Breast tenderness.

B. Breakthrough bleeding within first 3 months of use.

C. Decreased menstrual flow.

D. Blurred vision and headache.