This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
Which among the following is a contraindication for forceps ? 
Select and explain. 
A. Face, B. Occipito posterior, C. Brow presentation, D. Aftercoming head
C: Brow presentation
Answer: C: Brow presentation 
Explanation: Ans: c (Brow presentation) Ref: Dutta, 6th ed, p. 393The engaging diameter of head in brow presentation is mento vertical (14 cm), so there is no mechanism of labor in an average size baby with normal maternal pelvis in brow presentation. Persistent brow presentation is delivered by elective caesarean section.Conditions to be fulfilled prior to forceps operationF - favorable head position and stationO - open os(fully dilated)R - ruptured membranesC - contractions presentE - engaged head, empty bladderP - pelvimetry-no major CPDS - stirrups, lithotomy position