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 eukaryotes, RNA polymerase I transcribes: 
 Options:  <1> Small rRNA <2> Pre-mRNA. <3> ARNsno. <4> ARNt. <5> Large rRNA.

Output: 5


Input: Consider Input: Question: A microelectrode is characterized by: 
 Options:  <1> Give answers in steady state. <2> Always need an inert electrolyte. <3> Always need a potentiostatic system. <4> Do not need a reference electrode. <5> Always need agitation.


Output: 1