Is it possible to build a artificial intelligence as is there in iron man 3. I mean that answers to every question.

Question

Which programming language can be used?

Answer 1

Which programming language, difficult answer...

There are many projects, both commercial and open source, which can be a start to work on. Programming languages are many....try to have a look on some of these projects...

Here there is a comprehensive list of projects related to your question...
https://en.wikipedia.org/wiki/List_of_artificial_intelligence_projects

Some of my favorites...
http://caffe.berkeleyvision.org/
https://www.microsoft.com/en-us/research/product/cognitive-toolkit/
https://deeplearning4j.org/
http://www.dmtk.io/
http://www.h2o.ai/
http://mahout.apache.org/
http://numenta.org/
http://www.opennn.net/
....and more ;-)