Information:  - MS-DOS (; acronym for "Microsoft Disk Operating System") is a discontinued operating system for x86-based personal computers mostly developed by Microsoft. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s and the early 1990s, when it was gradually superseded by operating systems offering a graphical user interface (GUI), in various generations of the graphical Microsoft Windows operating system by Microsoft Corporation.  - Alien Breed : Tower Assault is the third game in the Alien Breed franchise , a series of science fiction - themed , top - down shooters . It was released in 1994 by Team17 for the Amiga , PC , and CD32 , and it is the last 2D game in the series .  - Alien Breed is the first in the "Alien Breed" series of science fiction shooter video games played with a top-down view, for one or two players. It was released in 1991 by Team17 for the Commodore Amiga and later in 1993 by MicroLeague for MS-DOS.    Given the information above, choose from the list below the object entity that exhibits the relation 'platform' with the subject 'alien breed: tower assault'.  Choices: - amiga  - dos  - microsoft windows  - pc  - windows
dos