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: Consider Input: Question: If you want to estimate the effects of an intervention, you will use: 
 Options:  <1> A transversal design. <2> A retrospective design <3> An ecological study. <4> A randomized clinical trial. <5> An observational design with random selection of the participants.

Output: 4


Input: Consider Input: Question: In the oxaciclohexane-type conformer of sugar -D - (+) - glucopyranose: 
 Options:  <1> One of the OH- groups is axial, but the remaining substituents are equatorial. <2> The CH2OH group is axial but the remaining groups are equatorial. <3> All groups are axial. <4> All groups are equatorial. <5> The CH2OH group is equatorial but the remaining groups are axial.

Output: 4


Input: Consider Input: Question: The trophoblast develops from: 
 Options:  <1> The outer layer of the blastocyst. <2> The internal cell mass. <3> The zona pellucida. <4> The bilaminar germinative disc. <5> The endometrium


Output: 1