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irrelevant ads are shown such as Charity, Cancer research etc.
These are PSA ads, and are shown when Google either doesn't have sufficient targeted ads to display, or they haven't indexed those pages yet. They can also be shown for some types of dynamic URLs, and for sites with session IDs.
If you have just added AdSense to the site, it will usually take a short while for targeted ads to appear. If they don't show after a day, and it is not a problem due to session IDs or dynamic URLs, drop the AdSense team an email asking about it.