This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Obs, Subject name: Gynaecology & Obstetrics
Instrumental delivery system is: 
Select and explain. 
A. Forceps only used in full cervical dilation, B. Forceps used when ventouse fails, C. Ventouse cannot be used in rotational deliveries of occipito-posterior and transverse presentations, D. Forceps can be used in breech deliveries
B: Forceps used when ventouse fails
Answer: B: Forceps used when ventouse fails 
Explanation: 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