<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A genetic population study is being conducted to find the penetrance of a certain disease. This disease is associated with impaired iron metabolism and primarily affects the liver. Patients often present with diabetes and bronze skin pigmentation. After a genetic screening of 120 inhabitants with a family history of this disease, 40 were found to have the disease-producing genotype, but only 10 presented with symptoms. What are the chances of the screened patients with said genotype developing the disease phenotype? ? A: 3, B: 25, C: 4, D: 40, E: 0.4,  <response>: This is a question about calculating penetrance, which is the proportion of individuals with a particular genotype that exhibit the expected phenotype. The question provides information that 120 inhabitants with a family history of a disease were genetically screened, and 40 were found to have the disease-producing genotype. Of those 40, only 10 presented with symptoms of the disease. To calculate penetrance, we take the number of people with the genotype who exhibit the phenotype 10 and divide by the total number of people with the genotype 40. B: 25 