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'.
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Question: Question: Indicate the amino acid that, under physiological conditions, has an uncharged side chain: 
 Options:  <1> Arginine <2> Aspartic acid. <3> Glutamic acid. <4> Lysine <5> Threonine

Answer: 5


Question: Question: Catalase: 
 Options:  <1> Acts on hydrogen peroxide. <2> It results in the formation of hydrogen peroxide. <3> It acts on the superoxide anion. <4> It converts hydrogen peroxide into superoxide anion. <5> Use glutathione as a cofactor.

Answer: 1


Question: Question: Controls the passage of substances to the central nervous system: 
 Options:  <1> Meninges. <2> Choroid plexus. <3> Hemato-encephalic barrier. <4> White substance <5> Schwann cells and oligodendrocytes.

Answer:
3