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: 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.
Example Output: 4

Example Input: Question: In the scheme of the stages of Tanner's pubertal development, the stage or level 5 in women corresponds to: 
 Options:  <1> Light bulge of the breast button and increase of the areolar size. <2> Growth of the breast, presence of light pubic hair and roundness of the hips. <3> Slight mammary protrusion and beginning of roundness of the hips. <4> Full development of the breast and triangle of full pubic hair as in adult women. <5> The beginning of the thelarchy.
Example Output: 4

Example Input: Question: The sequencing of an oligosaccharide is done by: 
 Options:  <1> Degradation Edman. <2> Chromatography Whatman. <3> Patch-Clamp. <4> Mass spectrometry. <5> Capillary electrophoresis.
Example Output:
4