Correct option is (c) Pacemakers
Explanation: FDA has different classes of devices. These have different kind of manufacturing guidelines and practices which should be followed. Such as Class I includes bandages, gloves, Stethoscopes. Class II devices include thermometers and endoscopes. Class III devices include those which come in contact with the body fluids and are kept at that place for a long time such as that of pacemakers and heart valves.