Update README.md

README.md

@@ -57,7 +57,7 @@ The output will be given in XML format like:
 <choice id="b">Choice B</choice>
 <choice id="c">Choice C</choice>
 <choice id="d">Choice D</choice>
-<answer value="a,b,c,d"/>
+<answer value="a"/>
 </multiple-choice>
 ... more <multiple-choice></multiple-choice> tags
 </quiz>