Pandoc: markdown to HTML conversion, highlighter syntax

Question

I am converting markdowns to HTML, and I want to include syntax highlighted code.

I am working with some markdown that contains syntax like:

~~~ {.c} long factorial (int n) { long result = 1; while (n > 1) result *= n--; return result; } ~~~ 

but I don’t know what syntax highlighting extension was used to handle this syntax. What is a good extension?