Well looks like this was being added 'by default', so I found out I can use URL Rewrite Module to remove Pragma from Headers, below the code

<configuration>
<system.webServer>
<rewrite>
  <outboundRules>
    <rule name="Remove Pragma Header">
      <match serverVariable="RESPONSE_Pragma" pattern=".+" />
      <action type="Rewrite" value="" />
    </rule>
  </outboundRules>
 </rewrite>
</system.webServer>
</configuration>