When Is the Most Critical Time Period for Development and Also

Multiple Choice

When is the most critical time period for development and also the most dangerous time to use teratogens?

A) Three weeks prior to conception- Four weeks after last menstrual period
B) Four weeks after last menstrual period- Fifteen weeks after last menstrual period
C) Fifteen weeks after last menstrual period- 25 weeks after last menstrual period
D) The three weeks prior to the delivery of the baby