The answer is B (An app on your smartphone that tracks the nutritional status of foods you eat)
Vaccination Laws for State Healthcare Workers, State School and Childcare workers.
Control of Communicable Diseases
Occupational Safety and Health
just to name a few
Answer - Blood Flow
Reasoning - Insulin is used through out and mainly in the blood stream which relies it to stabilize through out the flow of the body
They could be suffering from the amenorrhea cause it gives you cancer