Assertion : A large number of infectious diseases like polio , diphtheria ,pneumonia and tetanus have been controlled to a large extent by the use of vaccines.
Reason : Discovery of antibiotics and various other drugs has also enabled us to effectively treat non-infectious diseases.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.
