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 type of epidemiological study indicated to evaluate, in a population initially exempt from the health problem under study, the association between a risk factor and the onset of the disease is: 
 Options:  <1> Randomized clinical trial. <2> Quasi experimental. <3> Ecological studies <4> Cases and controls study. <5> Cohort study.
Example Output: 3

Example Input: Question: Which of the following moments of the electrocardiogram corresponds to the depolarization stage of the ventricular myocardium ?: 
 Options:  <1> Onda P. <2> Onda T. <3> Segment T-P. <4> Segment P-Q. <5> QRS wave.
Example Output: 5

Example Input: Question: Indicates which bone is the lesser trochanter: 
 Options:  <1> Fibula. <2> Tibia. <3> Humerus. <4> Femur. <5> Radio.
Example Output:
4