Interstitial cystitis and gout are the two conditions that would be best treated with naproxen.
Drugs may be defined as any chemical substance that is commonly used to dissuade, treat, or diagnose a particular disease or disorder.
As naproxen is used to relieve pain by reducing inflammation, it only treats those symptoms or diseases which are associated with pain and inflammation.
Hence, interstitial cystitis and gout deal with the same principle where naproxen works.
Therefore, the correct option for this question is C.
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