You will be given a definition of a task first, then some input of the task.
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: Of the following statements, one is NOT a trigger for abdominopsychoneurological crises in acute porphyria. Indicate which:
Options: <1> The luteal phase of the menstrual cycle. <2> The enzymatic hepatic inducer drugs. <3> The infections <4> A restrictive diet in proteins. <5> The protease inhibitors used in HIV infection.
Output:
4