The major contribution of amniotic fluid after 20 weeks of gestation :: (A) Ultrafiltrate and maternal plasma, (B) Fetal urine, (C) Fetal lung fluid, (D) Fetal skin
Answer is B. Origin of amniotic fluid : Early week -Maternal plasma 2 nd trimester - Fetal skin Beyond 20 weeks -Fetal urine Ref: Datta Obs 9e pg 34.