Final answer:
The Tru-Cut needle is the instrument used for liver biopsies, designed to extract a cylindrical tissue sample for analysis.
The correct answer is option d. Tru-Cut needle
Step-by-step explanation:
The instrument used to obtain a liver biopsy is the Tru-Cut needle. This device is specifically designed to remove a small piece of tissue from the liver, which can then be analyzed for signs of disease or damage. The Tru-Cut needle is preferred for its ability to extract a cylindrical core of tissue, which provides a comprehensive sample for histological examination.