This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
A female presents with leaking and meconium stained liquor at 32 weeks. She is infected with 
Select and explain. 
A. CMV, B. Listeria, C. True Toxoplasma, D. Herpes
B: Listeria
Answer: B: Listeria 
Explanation: "Discolored brownish or meconium stained amniotic fluid is common with fetal infection, even with preterm gestation '' Hence correct answer is Listeria, rest of the infections do not lead to preterm Labour with meconium stained liquor. Ref. Williams Obs 23/e p1224