Correct option is (a) Stethoscope
For explanation: Radiological products such as lasers, x-rays and ultrasound machines also may be medical devices are subjected to FDA regulations. Television receivers, microwave ovens, and laser range finding devices, as “radiation-emitting electronic products,” also are subject to FDA regulation. These devices are subject to varying levels of reporting and record-keeping requirements. The radiation-emitting levels are checked by the FDA and are kept under a controllable range.