Detailed Instructions: 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'.
Problem:Question: Exposure to androgens in a sensitive or critical period, at the beginning of development, causes masculinization of the sexual and behavioral organs. This effect has received the name of:
Options: <1> Motivational effect <2> Effect of pheromones. <3> Activating effect. <4> Organizer effect. <5> Biological effect
Solution:
4