<prompt> Most common cause of repeated 2nd-trimester foetal loss isChromosomal anomalyIntrauterine infectionAbnormality of cervix and uterusHormonal imbalance  <response>: Common known causes of aboion: First trimester: defective germ cells, hormonal deficiency, trauma, acute infection. Second trimester: Cervical incompetence, uterine malformations, uterine fibroid, low implantation of placenta, twins and hydramnios 