Cource of a disease process without any' intervention is the definition of -
Spectrum of disease
Epidemiology of disease
Natural history of disease
Iceberg phenonenon
Ans. is 'c' i.e., Natural history of disease o Natural history of disease signifies the way in which a disease evolves over time from the earliest stage of its prepathogenesis phase to its termination as recovery, disability or death, in the absence of treatment or prevention.