What type of dressing is thick, composed of two layers of gauze and a cotton center, used for larger wounds?

The correct choice is trauma dressing, which is specifically designed for larger wounds. Trauma dressings are thick, comprising layers of gauze with a cotton center that allows for effective absorption of blood and exudate, while also providing cushioning to protect the wound from further injury and contamination. This type of dressing is particularly beneficial in emergency situations where significant bleeding may be present, as it can help control hemorrhage and facilitate stabilization until further medical care can be rendered.

In contrast, pressure bandages are typically used to apply direct pressure to help control bleeding but may not have the same thickness or absorption capacity as trauma dressings. Elastic bandages are designed more for support and stabilization of injuries rather than for use on larger wounds, while occlusive dressings are used to create a waterproof barrier, often for specific types of wounds such as those that may need to prevent contamination or moisture. Each dressing has a specific purpose, with trauma dressings standing out for their suitability for larger, more severe wounds.