Use Naegele's rule to determine the EDD (estimated day of birth) for a patient whose last menstrual period started on April 12.
Correct Answer: B
Rationale: To calculate EDD using Naegele's rule, add 7 days to the first day of the last menstrual period, then count back 3 months and add 1 year. For this question, starting with April 12, adding 7 days gives April 19. Counting back 3 months gives January 19 of the following year. Therefore, the estimated day of birth (EDD) is January 19. Choice B (19-Jan) is correct.
Choice A (19-Feb): Incorrect as it does not follow the correct calculation method for Naegele's rule.
Choice C (21-Jan): Incorrect as the calculation does not match the steps of Naegele's rule.
Choice D (7-Feb): Incorrect as it does not align with the correct application of Naegele's rule.