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: The demographic dynamics of a community is determined by: 
 Options:  <1> Natality <2> Mortality. <3> Immigration. <4> Emigration. <5> All are correct.
Example Output: 5

Example Input: Question: What procedure is part of the cognitive-behavioral intervention program for hypochondria proposed by Warwick and Salkovskis ?: 
 Options:  <1> The systematic desensitization in imagination to extinguish the fear of interoceptive sensations. <2> The stopping of thought to block intrusive thoughts about the disease. <3> The training in mindfulness to reduce the appearance of annoying bodily sensations. <4> The prevention of response to reduce body checking behaviors and search for reassuring information. <5> The resolution of the underlying conflicts related to guilt and dependency needs.
Example Output: 4

Example Input: Question: According to the Frank-Starling mechanism of the heart, under physiological conditions the cardiac output is directly proportional to: 
 Options:  <1> The size of the ventricle. <2> The heart rate <3> The venous return. <4> The thickness of the myocardium. <5> All the previous answers are correct.
Example Output:
3