A 29-year-old primigravida at 10 weeks gestation attends her booking visit. She is healthy with no significant past medical history. What is the most appropriate screening test to offer at this stage according to UK antenatal care guidelines?A50 g oral glucose tolerance test for gestational diabetesBCombined first-trimester screening for Down syndrome (nuchal translucency and serum markers)CRoutine CT scan to screen for fetal anomaliesDGroup B Streptococcus vaginal swabEHIV, hepatitis B and syphilis screeningCheck my answer