In materia medica study, what distinguishes a 'keynote' symptom from a 'common' symptom of a remedy?
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A
Keynotes appear in every patient requiring that remedy; common symptoms appear in only some
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B
Keynotes are highly characteristic and individualizing; common symptoms are shared with many remedies and pathologies
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C
Keynotes are always mental symptoms; common symptoms are always physical
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D
Keynotes are from provings only; common symptoms are from clinical experience only