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'.

[EX Q]: Question: A 5-year-old boy with symptoms of possible meningitis is seen in an emergency department. Gram-negative diplococci and abundant polymorphonuclear leukocytes are observed in the Gram stain of the cerebrospinal fluid sediment. What microorganism does it suggest as a possible cause of the infection ?: 
 Options:  <1> Haemophilus influenzae. <2> Streptococcus pneumoniae <3> Streptococcus agalactiae. <4> Neisseria meningitidis. <5> Listeria monocytogenes.
[EX A]: 4

[EX Q]: Question: With vaginal ultrasound, from how long after conception is it possible to see an embryo with a heartbeat? 
 Options:  <1> Between 14 and 21 days. <2> Between 21 and 28 days. <3> Between 28 and 35 days. <4> Between 35 and 42 days. <5> Between 42 to 49 days.
[EX A]: 2

[EX Q]: Question: Which of the following antitumor agents acts forming a covalent and irreversible complex with the thymidylate synthase and its cofactor, previous activation to the corresponding deoxynucleotide? 
 Options:  <1> Methotrexate <2> Bortezomib. <3> Cyclophosphamide <4> 5-Fluorouracil. <5> Taxol.
[EX A]:
4