Problem: An epidemiologist decides to investigate the incidence of diabetes in a population of 300 older adults who live in a nursing home. She visits the nursing home in January 1, 2017, and later in December 31, of the same year. She looks into the records of these patients and learns that in her first visit, 25 patients had diabetes and 35 in her second visit. What number should be in the numerator for her calculation of incidence?
O 10
O 300
O 35
O 25