Bimodality in person distribution refers to____.: (A) Description of two etiological hypothesis of a disease in one person., (B) Evaluation of two different environmental factors of a person in  a disease causation., (C) Two separate peaks instead of in the age incidence curve of a disease., (D) Highest point of curve in age incidence curve of a disease.
Answer is C. Bimodality

Sometimes  there  may  be two  separate  peaks instead of one in the age incidence curve of a  disease.
Example-  Hodgkin's lymphoma shows bimodal curve with peaks at 15-20 years and 70-80 years.