<prompt> Instrumental delivery system is:Forceps only used in full cervical dilationForceps used when ventouse failsVentouse cannot be used in rotational deliveries of occipito-posterior and transverse presentationsForceps can be used in breech deliveries  <response>: Ans. B. Forceps used when ventouse failsVentouse - is an instrumental device designed to assist delivery by creating a vacuum between it and the fetal scalp.In case of failed ventouse, forceps may be used if1. Head is almost completely rotated2. Cervix is fully dilated3. There is some degree of descent 