Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The type of epistasia that explains the 15: 1 dihybrid phenotypic ratio is: 
 Options:  <1> Double dominant. <2> Simple recessive <3> Recessive dominant double. <4> Double recessive <5> Simple dominant.
