Task: Question Answering
Input (English): 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
Output (English): 4