Vitamin C is known as ascorbic acid. It is a water-soluble vitamin. Unlike most mammals, humans do not have the ability to make their own vitamin C. Therefore, we must obtain vitamin C through our diet. Disease resulting from severe vitamin C deficiency is Scurvy.
Hence, scurvy is
caused by a deficiency of a vitamin C(ascorbic acid).
So, the correct option is 'both assertion and reason are correct
and the reason is the correct explanation for assertion'.