A remedy can be of any sort , a nososde relates to miasmatic interrealtionship. Tuberculinum is a nosode - Arnica is not. Psorinum is a Nosode .
one should always - in my opinion - try to locate the miasmatic influence that is most prominent , as this will also indicate remedies relating to that miasm - Calc carb relates to the nosode Tuberculinum etc.
The important miasm is that which is near the surface- others may emerge as treatment5 progress's