org-src-lang-modes

org-src-lang-modes is a variable defined in `org-src.el'.
Its value is shown below.

Documentation:
Alist mapping languages to their major mode.
The key is the language name, the value is the string that should
be inserted as the name of the major mode. For many languages this is
simple, but for language where this is not the case, this variable
provides a way to simplify things on the user side.
For example, there is no ocaml-mode in Emacs, but the mode to use is
`tuareg-mode'.

You can customize this variable.

Value:

(("ocaml" . tuareg)
 ("elisp" . emacs-lisp)
 ("ditaa" . artist)
 ("asymptote" . asy)
 ("dot" . fundamental)
 ("sqlite" . sql)
 ("calc" . fundamental)
 ("C" . c)
 ("cpp" . c++)
 ("C++" . c++)
 ("screen" . shell-script))