This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Gynaecology & Obstetrics
EDD ( Expected Date of Delivery) is calculated by: 
Select and explain. 
A. Young's rule, B. Naegele's formula, C. Cardiff Formula, D. Hadlock Formula
B: Naegele's formula
Answer: B: Naegele's formula 
Explanation: Expected date of delivery is calculated by - Naegele's formula From the 1st day of last menstrual cycle - 9 months + 7 days