**Core Concept**
Ventouse assisted delivery, also known as vacuum extraction, is a technique used to assist in the delivery of a baby when a vaginal delivery is anticipated but difficult. The procedure involves the use of a vacuum extractor to apply gentle traction to the baby's head.

**Why the Correct Answer is Right**
The pressure applied during ventouse assisted delivery is typically set between 0.5 and 0.8 kg/cm². This pressure range is sufficient to facilitate the delivery of the baby's head without causing undue harm to the mother or the baby. The pressure is applied using a vacuum extractor, which is attached to the baby's head with a soft cup. The cup is then connected to a handle that is used to apply gentle traction to the baby's head.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because pressures above 0.8 kg/cm² can cause injury to the baby's scalp or the mother's perineum.
**Option B:** This option is incorrect because pressures below 0.5 kg/cm² may not be sufficient to facilitate the delivery of the baby's head.
**Option C:** This option is incorrect because the pressure range for ventouse assisted delivery is not typically between 0.2 and 0.4 kg/cm².

**Clinical Pearl / High-Yield Fact**
It is essential to ensure that the correct pressure is applied during ventouse assisted delivery to avoid complications such as fetal scalp injury or maternal perineal trauma.

**Correct Answer:** C.