Which of the following statements is true of vitamin c? a. an excess of the vitamin can result in gallstones. b. it inhibits iron absorption. c. a lack of the vitamin causes beriberi. d. it maintain connective tissues. e. it prevents common cold.

Option C

Explanation:

Vitamin C or Ascorbic acid is very essential to maintain bones and cartilages and enhance the immunity system. It is also very essential for blood clotting. It is a water soluble vitamin that leads to problem of scurvy. Some other advantage of vitamin C includes –  

a)Act as an antioxidant

b)It regulates and maintains the collagen i.e connective tissue protein

c)Prevents infection and  

d)Absorbs iron.  

Beriberi  is caused by the deficiency of vitamin B-1 and not vitamin c

Option C

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).