<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A retrospective study was conducted in a US county in order to determine the frequency of hypodontia tooth agenesis, the most common craniofacial malformation in humans, as well as to assess the need for an interdisciplinary approach to managing subsequent functional and esthetic sequelae in a target population. Using a dental administration computer software tool, a total of 1498 patients who visited the outpatient clinic of a large specialist dental center between April 2017 and February 2018 were identified. The group comprised 766 women and 732 men. Hypodontia was found in 6.3 of the patients, a rate that was consistent with the average values found in the published medical literature. Which measure of frequency was used to describe the percentage of patients affected by hypodontia in this example?? A: Point prevalence, B: Period prevalence, C: Cumulative incidence, D: Incidence rate, E: Attack rate,  <response>: This is a question asking about the type of frequency measure used in the given example. The example describes a retrospective study looking at the frequency of hypodontia in patients who visited a dental clinic over a period of time. The frequency is reported as the percentage of patients affected out of the total sample. The choices describe different types of frequency measures in epidemiology. Point prevalence measures the proportion of people with a condition at a single point in time. Period prevalence measures the proportion over a defined period of time. Cumulative incidence measures the number of new cases over time. Incidence rate measures the number of new cases per population at risk over time. Attack rate measures the proportion of exposed people who develop the condition.Since the example measures the percentage of patients affected out of a sample over a defined period of time April 2017 to February 2018, this is a measure of period prevalence.B: Period prevalence 