<prompt> Most common cause of early miscarriages isNatural diabetesCervical incompetenceChromosomal abnormalityGenitourinary infections  <response>: Ans. c Chromosomal abnormality. Ref. Dutta, Obstetrics, 5th ed., 211ETIOLOGY OF SPONTANEOUS ABORTIONMISCARRIAGE1. Ova- fetal factors 60- operate in early abortion. Chromosomal abnormality commonest being autosomal trisomy, monosomy Gross congenital malformations. Blighted ovum, hydropic degeneration of villi Interference with circulation cord twist 