Final answer:
The most appropriate surgical needle used in a liver resection is a cutting needle. It has a triangular-shaped blade to facilitate easier penetration and minimize tissue tearing.
Step-by-step explanation:
The surgical needle most appropriately used in a liver resection is a cutting needle. Cutting needles have a triangular-shaped blade along the end, which allows for easier penetration of the liver tissue and reduces the risk of tissue tearing. This type of needle helps surgeons make precise and clean incisions during the resection.