Legal liabilities that result from opioid litigation are expected to be the responsibility of Mallinckrodt Inc. or its subsidiaries following the separation. Mallinckrodt has two main product lines. In the fourth quarter of 2014, Specialty Pharmaceuticals accounted for 74% of net sales. Key specialty pharmaceutical products include:  Key generic specialty products include:  Medical Imaging products include Optiray (ioversol injection), an iodide based contrast medium for CT scans, and Optimark (gadoversetamide injection) a Gadolinium-Based Contrast Agent used in magnetic resonance imaging of the brain or liver. As of 1988, Mallinckrodt was the only company in the US that is allowed to receive cocaine, which it has used to make cocaine hydrochloride, a prescription drug used in hospitals as a local anesthetic by eye and ear, nose and throat doctors.