'Course of a disease process without any intervention' is the definition of: (A) Spectrum of disease, (B) Epidemiology of disease, (C) Natural history of disease, (D) Iceberg Phenomenon
Answer is C. Natural history of disease refers to the progression of a disease process in an individual over time, in the absence of treatment Spectrum of disease signifies that the health of an individual is not static Ref : Park's Textbook of Preventive and Social Medicine; 23rd edition - Pgno. 34