input: Text: Obstetrics for beginners It's my first go at delivering a baby by caesarean section – and the foetal head is impacted, jammed in its mother's pelvis. To be honest I'm struggling. Incisions have been made in the lower part of the mother's abdomen and womb. I've pushed my gloved hand inside and managed to slide my fingers between the baby's head and the surrounding uterine tissue. But it's difficult. The baby is tightly wedged in. I've had to push hard to get my hand to the far side of its head, and even though I'm now cupping and grasping it in the approved manner, I can't seem to pull it out. Dare I grip its head more firmly? Dare I pull harder? The baby's mother – she's called Debra – remains impassive throughout these agonised fumblings. Her face reveals nothing of what she may be feeling. But then Debra has no feelings. Indeed she has no face... So you can stop worrying. Debra – Desperate Debra to use her full trade name
  Question: What does the Tydeman tube do?
  
   (A) The Tydeman tube is placed in the uterus near the baby's head. The tube opens into a soft silicone cup, which is placed on the part of the head that is exposed through the cervix. Pushing air in through the tube releases suction forces that may be holding the baby in place.
   (B) The Tydeman tube is placed in the uterus near the baby's head. The doctor can inflate or deflate the tube as necessary to help ease the baby out of the birth canal.
   (C) The Tydeman tube is placed in the uterus near the baby's head. The tube opens into a soft silicone cup, which is placed on the part of the head that is exposed through the cervix. Pulling air out through the tube releases suction forces that may be holding the baby in place.
   (D) The Tydeman tube is placed in the uterus near the baby's head. Pushing air in to inflate the tube keeps the umbilical cord from closing around the baby's neck.
  Answer:
output: The Tydeman tube is placed in the uterus near the baby's head. The tube opens into a soft silicone cup, which is placed on the part of the head that is exposed through the cervix. Pushing air in through the tube releases suction forces that may be holding the baby in place.