Final answer:
Vaccines do provide immunity against diseases.
Step-by-step explanation:
The statement that is not true is option D: Vaccines do not provide immunity against diseases.
Vaccines are substances that stimulate the immune system to produce immunity against specific pathogens, such as bacteria or viruses. They contain weakened or inactivated forms of the pathogen, or pieces of the pathogen, that cannot cause the disease but can still trigger an immune response. This immune response helps the body recognize and fight the pathogen if it is encountered again in the future, preventing or reducing the severity of the disease.