This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pregnancy in Rh-negative Women, Subject name: Gynaecology & Obstetrics
[{'content': 'Hydrops fetalis is associated with? \nSelect and explain. \nA. Hepatitis B, B. Parvovirus B 19, C. Malaria, D. Tuberculosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: (B) Parvovirus B 19REF: Williams Obstetrics 22nd edition Table 29-8, Harrisons Internal Medicine 17th edition Chapter 177. Parvovirus InfectionsB19 infection during pregnancy can lead to hydrops fetalis and/or fetal loss. The risk of transplacental fetal infection is 30%, and the risk of fetal loss (predominantly early in the second trimester) is 9%. The risk of congenital infection is <1%.Infections causing non-immune hydrops:CytomegalovirusToxoplasmosisSyphilisCongenital hepatitisRubellaParvovirus B 19LeptospirosisChagas disease', 'role': 'assistant'}]