Which of the following inflammation indices is used in national epidemiologic surveys, including the National Health and Nutrition Examination Survey (1971–1974)?

A) Sulcus Bleeding Index (Mühlemann and Son 1971)
B) Gingival Index (GI) (Löe 1967)
C) Periodontal Index (PI) (Russell 1967)
D) Calculus Index of the National Institute of Dental Research (Miller et al. 1987)
E) Periodontal Screening and Recording (PSR)

C