Correct option is (b) Thermometers
Explanation: FDA has different classes of devices such as Class I includes bandages, gloves, Stethoscopes. These have different kind of manufacturing guidelines and practices which should be followed. Class II devices include thermometers and endoscopes which come in contact with the body fluids. Class III devices include those which come in contact with the body fluids such as that of pacemakers and heart valves.