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'.

Q: Question: With what scope is the Theory of the Melzack Gate and Wall related ?: 
 Options:  <1> Cancer. <2> HIV infection <3> Renal problems. <4> Pain. <5> Cardiovascular disorders

A: 4
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Q: Question: Acetylsalicylic acid is a compound whose pKa is 3.5. What percentage of a dose of this product can be absorbed in the stomach fasting (pH 1.5)? 
 Options:  <1> Less than 10% <2> Between 10% and 20%. <3> More than 90% <4> Between 20% and 40%. <5> 50%

A: 3
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Q: Question: After antigenic recognition, the T cell receptor transmits an activation signal through: 
 Options:  <1> CD3 and chain . <2> Ig and Ig. <3> TAP1 and TAP2. <4> RAG1 and RAG2. <5> Determining regions of complementarity 1 and 2.

A:
1
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