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How many types of nucleotides are present in DNA?

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How many types of nucleotides are present in DNA?

(a) 1

(b) 2

(c) 3

(d) 4

I got this question in examination.

Enquiry is from Chemical Basis of Life in portion Chemical Basis of Life of Cell Biology

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The correct answer is (d) 4

To elaborate: There are four types of nucleotides present in a DNA (or RNA) strand. DNA consists of adenine, guanine, cytosine and thiamine; RNA on the other hand consists of uracil instead of thiamine and other three nucleotides are similar.

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