This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Instrumental delivery system is \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ventouse - is an instrumental device designed to assist delivery by creating a vaccum between it and the fetal scalp. In case of failed ventouse, forceps may be used if 1. Head is almost completely rotated 2. Cervix is fully dilated 3. There is some degree of descent', 'role': 'assistant'}]