Given the task definition and input, reply with output. 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'.

Question: Fatty fish, commonly called blue, are those that contain just over 10% fat. Which of the following is a lean fish and, therefore, with a lower fat intake?
Options: <1> Sardine. <2> Eel. <3> Salmon. <4> Sole. <5> Mackerel.
4