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'.

Question: If I can not learn my new phone number because I always see the first three digits of the old one, what is the name of that type of interference? 
 Options:  <1> Proactive <2> Retroactive. <3> Coactive <4> Reactive <5> Protoactive
1

Question: The oxygen of the ethers as that of the alcohols can be protonated to generate: 
 Options:  <1> Iminium ion. <2> Alkaloxonium ions. <3> Peroxides <4> Piranos. <5> Enaminas
2

Question: Hypokalemia is a physiological symptom that can typically occur: 
 Options:  <1> In sleep disorders. <2> In addictions. <3> In anorexia nervosa. <4> In bulimia but not in anorexia nervosa. <5> In disorders of attention deficit and disturbing behavior.

3