Tax credit u/s 90

Mr. A was a resident in India and stayed in India for 8 months in the current Financial Year and then went to USA for job there. He has earned Salary and the following Taxes were deducted from his salary

1. Federal Tax

2. Social Securities Tax

3. Medicare Tax

4. State Tax

From the above, what are the taxes we can claim as credit u/s 90?

Thanks.