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'.
Input: Question: Which of the following data is NOT specific to hypertrophic pyloric stenosis?
Options: <1> Metabolic alkalosis <2> Projective vomiting of bilious content. <3> Family incidence <4> Predominance of the masculine sex. <5> Palpable mesoepigastric mass.
Output:
2