Fetus is most radio sensitive at which week?: (A) 3 weeks, (B) 8 weeks, (C) 12 weeks, (D) 15 weeks
Answer is A. ANSWER: (A) 3 weeksREF: Primer of radiobiology by Elizabeth Latorre Travis page 196The first trimester, particularly the first 6 weeks of development, appears to be the most radiosensitive in terms of both lethality and induction of congenital abnormalities in humansHence the answer is 3 weeks