What feature film was the first to use CGI?

Here is the question :

WHAT FEATURE FILM WAS THE FIRST TO USE CGI?

Here is the option for the question :

• Westworld
• True Grit
• Jane Got a Gun
• The Salvation

The Answer:

And, the answer for the the question is :

Explanation:

[STC0012092]. The original ‘Westworld’ was released in 1973, long before HBO’s slick reboot series. It told the straightforward story of a Western theme park where the mechanical cowboys begin slaughtering visitors. Written and directed by Michael Crichton, “The Gunslinger” uses CGI to put the viewer in the shoes of Yul Brenner’s homicidal title character. This had never been done before in Hollywood, therefore images from a Mars satellite were used as reference.