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: The standard free energy of activation of a reaction is:
Options: <1> The difference in free energy between the basal state of the products and the substrates. <2> The difference of the enthalpy minus the entropy of the system. <3> The basal energy of the substrates in a catalyzed reaction. <4> The additional free energy that molecules must reach to reach the state of transition. <5> The energy released from a catalysed reaction.
Example Output: 4

Example Input: Question: To multiply, the rhabdoviruses enter the host cell by:
Options: <1> Viropexy <2> Endocytosis <3> Depopolimerization of the virion as a consequence of the interaction with the cellular receptor. <4> Direct translocation <5> Opsonic phagocytosis.
Example Output: 2

Example Input: Question: Acid chlorides can be transformed into carboxylic acids:
Options: <1> Through a hydrolysis catalyzed by an acid or a base. <2> Through a reduction reaction with lithium aluminum hydride. <3> Through a reduction reaction with sodium borohydride. <4> Through a reduction reaction with diborane. <5> It is not possible due to the lack of reactivity that characterizes acyl halides.
Example Output:
1