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
Highest rate of transmission of toxoplasmosis during pregnancy is seen in: 
Select and explain. 
A. 1st trimester, B. Ilnd trimester, C. IlIrd trimester, D. Puerperium
C: IlIrd trimester
Answer: C: IlIrd trimester 
Explanation: “The incidence and severity of congenital infection depend on fetal age at the time of maternal infection.The risks for fetal infection increases with duration of pregnancy from 6 % at 13 weeks to 72 % at 36 weeks. Conversely the severity of fetal infection is much greater in early pregnancy and fetuses are much more likely to develop clinical findings of infection."
Williams Obs. 24/e, p 1255