This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Maximum teratogenic effect on hea of fetus is between? 
Select and explain. 
A. 2 - 4 weeks, B. 4 - 6 weeks, C. 6 - 8 weeks, D. 8 - 10 weeks
C: 6 - 8 weeks
Answer: C: 6 - 8 weeks 
Explanation: Ans. is 'c' i.e.,6 - 8 weeksPeriod of organogenesis (Embryonic - 2 - 8 weeks of conception) is the time of maximum vulnerability, and each embryonic system has a period of maximum susceptibility.Hea is typically affected if the teratogen acts between 6 - 8 weeks of gestation.CNS maximum susceptibility between 17 - 30th post feilization days.