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 demographic dynamics of a community is determined by: 
 Options:  <1> Natality <2> Mortality. <3> Immigration. <4> Emigration. <5> All are correct.
Example Output: 5

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: The reaction of 3-nitrobenzaldehyde with NaBH 4 in aqueous methanol gives: 
 Options:  <1> 3-Aminobenzaldehyde. <2> 3-nitrobenzoic acid. <3> 1-Methyl-3-nitrobenzene. <4> 3-Nitrobenzoate sodium. <5> (3-Nitrophenyl) methanol.
Example Output:
5