<prompt> Which is the best marker for NTD?aFPhCGPseudocholinesteraseInhibin-A  <response>: a. aFPRef: Nelsons 20e p 2802Prenatal screening of maternal serum for AFP in the 16th-18th wk of gestation is an effective method for identifying pregnancies at risk for fetuses with neural tube defects in utero. 