how to read xml node when i have third node value in c#

Question

This is my XML file

<problem>

<sct:fsn>Myocardial infarction (disorder)</sct:fsn>

<sct:code>22298006</sct:code>

<sct:description>Heart attack</sct:description>

<sct:description>Infarction of heart</sct:description>

<sct:description>MI - Myocardial infarction</sct:description>

<sct:description>Myocardial infarct</sct:description>

<sct:description>Cardiac infarction</sct:description>

<sct:description>Myocardial infarction</sct:description>

</problem>

how to select Code and fsn ? if i have description.

please help thanks