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: The corpuscles of Pacini:
Options: <1> They are innervated by unmyelinated fibers. <2> They are mechanoreceptors of slow adaptation. <3> They have small receptor fields. <4> They are located in deep areas of the dermis. <5> They are thermoreceptors.
[EX A]: 4

[EX Q]: Question: The simultaneous expression of IgM and IgD is observed for the first time in lymphocytes:
Options: <1> Early Pro-B. <2> B mature. <3> Late Pro-B. <4> Pre-B. <5> B immature
[EX A]: 2

[EX Q]: Question: Among the partial reactions that lead to sodium carbonate by the Solvay Process, are:
Options: <1> The reaction between calcium carbonate and sodium chloride. <2> The precipitation of sodium hydrogen carbonate. <3> The thermal decomposition of ammonium chloride. <4> The formation of CaCO3 from CaO and CO2. <5> The reaction of ammonia with calcium oxide.
[EX A]:
2