The nurse is assisting a primigravid on calculating the due date of her baby using naegele rule. the most important information provided by the mother is:

The nurse is assisting a primigravid on calculating the due date of her baby using Naegele’s rule. The most important information provided by the mother is Expected Date of Birth. Naegele’s rule is used in Calculating Estimated/Expected delivery date (EDD). The equation is  Last Mentrual  Period minus 3 months plus 7 days plus 1 year.
(Should be approx. 280 days from LMP)

is this a psat question, if so do not cheat try your best.