This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Pressure in ventouse assisted delivery is: September 2006 \nSelect and explain. \nA. 0.4 kg/sq.cm, B. 0.6 kg/sq.cm, C. 0.8 kg/sq.cm, D. 1.0 kg/ sq.cm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: 0.8 kg/sq.cm A. Indications Suspicion of fetal compromise (e.g. nonreassurig Fetal Hea Tones) Maternal exhaustion Prolonged second stage of labor The pressure is gradually raised at the rate of 0.1 kg/sq.cm per minute until the effective vacuum of 0.8 kg/sq.cm is achieved in about 10 minutes time. B. Contraindications Cephalopelvic Dispropoion Fetal head not engaged Gestational age earlier than 34 weeks Known fetal disorders predisposing to complication -Bone mineralization disorders, Bleeding Disorder Malpresentation-Noncephalic presentation, Face Presentation (Occipitoposterior presentation is not a contraindication to vacuum Assisted Delivery) C. Precautions Vacuum can do as much or more damage as forceps D. Criteria to discontinue (prevent Subgaleal Hemorrhage): No progress after 3 pulls No baby extraction in 30 minutes after initiation Cup disengages 3 times Significant fetal scalp or maternal trauma', 'role': 'assistant'}]