This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Bimodality in person distribution refers to____. 
Select and explain. 
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.
C: Two separate peaks instead of in the age incidence curve of a disease.
Answer: C: Two separate peaks instead of in the age incidence curve of a disease. 
Explanation: 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.