This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
'Course of a disease process without any intervention' is the definition of 
Select and explain. 
A. Spectrum of disease, B. Epidemiology of disease, C. Natural history of disease, D. Iceberg Phenomenon
C: Natural history of disease
Answer: C: Natural history of disease 
Explanation: 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