Answer
B. CDC and FDA
Step-by-step explanation
Under the CDC,GID (Global Immunization Division) ensures effectiveness of global public health programs which include vaccination against deadly diseases. The division works with other partners to ensure vaccine-preventable diseases are handled. The Food and Drug Administration’s (FDA) top priority is the ensure the safety and effectiveness of vaccines. Through the Centre of Biologics Evaluation and Research (CBER), over sighting of vaccines in the U.S is done to assure the availability of safe and effective vaccines.