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'.

Example Input: Question: What element plays a physiological role in the prevention of gastroesophageal reflux?
Options: <1> Upper esophageal sphincter <2> Angle of His. <3> Hernia of Hiato. <4> Purkinje angle. <5> Pyloric sphincter
Example Output: 2

Example Input: Question: Question linked to image # 4 What would be the most likely radiological diagnosis to justify this finding?
Options: <1> Central bronchogenic carcinoma. <2> Left phrenic paralysis. <3> Anterior thoracic wall abscess. <4> Left pleural mesothelioma. <5> Anterior mediastinal lymphoma.
Example Output: 1

Example Input: Question: What is a prodrug?
Options: <1> A drug of series of a therapeutic class. <2> A drug that has been withdrawn from the market. <3> An inactive product that is enzymatically converted to an active drug. <4> A compound of natural origin from which one or more drugs are obtained by hemisynthesis. <5> A drug that lacks activity but enhances the action of others.
Example Output:
3