下列何者是孕婦噁心、嘔吐的後線用藥？
doxylamine 12.5 mg po tid + pyridoxine 10～25 mg po tid
pyridoxine 10～25 mg po tid
diphenhydramine 25～50 mg po q8h
methylprednisolone 16 mg po q8h x 3 days, then taper over 2 weeks
