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': 'Ideal timing to detect anencephaly is - \nSelect and explain. \nA. 10-12 weeks, B. 14-16 weeks, C. 16-18 weeks, D. 18-20 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is B 14-16 weeks o Anencephaly can be detected as early as 10-11 weeks of pregnancy. The ideal time to diagnose anencephaly is 14-16 weeks Diagnosis of fetal malformations o Many structural abnormalities in the fetus can be reliably diagnosed by ultrasound scan, and these can usually be made before 20 weeks. Common examples include; - Hydrocephalus Neural tube defects (anencephaly, myelomeningocele. spina bifida) Duodenal atresia Fetal hydrops Gastroschisis Examphalos o First-trimester ultrasonic soft tissue markers for chromosomal abnormalities such as : The absence of fetal nasal bone An increased fetal nuchal translucency Are now: in common use to enable detection of Down syndrome fetuses. o Earliest anomaly detected by USG is anencephaly # It can be detected at 10-11 weeks when cranium can be visualized ultrasonographically:', 'role': 'assistant'}]