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: Unknown
[{'content': '35 Year primigravida visited your clinic. USG given below: what is the diagnosis? \nSelect and explain. \nA. Anencephaly, B. Holoprocencephaly, C. Nuchal translucency, D. Hydrocephaly', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Nuchal translucency Ref.: D.C. Dutta 8th ed. / 735 * Nuchal translucency is a fluid behind the neck of the fetus. It is an anechoic space visible and seen in all fetuses between 11-14 weeks of age * The most common cause of increased nuchal translucency(> 3 mm) is aneuploidy where TURNER syndrome is the most common cause followed second by Down syndrome. * The reason why it is seen in 11-14 weeks is because at that time fetal lymphatics are developing and peripheral resistance is high and gradually disappears. * Remember: Cystic hygroma which is seen in Turner syndrome is high incidence is due to defective development of lymphatics.', 'role': 'assistant'}]