The acronym LMP refers to the ____. 

A. first day of a woman's last menstrual period
B. date of a woman's first menstrual cycle
C. last day of a woman's last menstrual period
D. estimated date of a woman's next menstrual period
E. date a woman was confirmed to be in menopause

A. first day of a woman's last menstrual period
The acronym LMP refers to the first day of a woman's last menstrual period.