Ans. is a, i.e. Ethacrydine lactateRef. Dutta Obs. 7/e, p 173Ethacridine lactate is drug of choice for extra-amniotic instillationAvailable as injection Emcredil (0.1%)Foleys catheter is introduced into extra-amniotic or extraovular space and bulb is inflated by 10-20 ml of Ethacridine solution.Dose is calculated as 10 ml/week of gestation upto maximum of 150 mlCatheter is left for 6 hours.Uterine action begins in 16-18 hours.In 30% cases abortion is incomplete and requires oxytocin drip or supplementation with prostaglandin.