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+# Complementary DNA
+Deoxyribonucleic acid (DNA) is a chemical found in the nucleus of cells and carries the "instructions" for the development and functioning of living organisms.
+
+    If you want to know more: http://en.wikipedia.org/wiki/DNA
+
+In DNA strings, symbols "A" and "T" are complements of each other, as "C" and "G". Your function receives one side of the DNA (string, except for Haskell); you need to return the other complementary side. DNA strand is never empty or there is no DNA at all (again, except for Haskell).
+
+    More similar exercise are found here: http://rosalind.info/problems/list-view/ (source)
+
+## Example: (input --> output)
+    "ATTGC" --> "TAACG"
+    "GTAT" --> "CATA"
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