Assertion : In servere cases the lips and finger nails may turn gray to bluish in colour in common cold.
Reason : Dysentery plague , diphtheria and typhoid are viral 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.