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: Indicate which of the following deficits leads to a porphyria: 
 Options:  <1> Phenylalanine hydroxylase. <2> 21 α-hydroxylase. <3> Ferrochelatase <4> Glucokinase. <5> Tyrosine hydroxylase.
[EX A]: 3

[EX Q]: Question: The main method for the preparation of βceto esters is the reaction known as: 
 Options:  <1> Malonic synthesis <2> Acetoacetic synthesis. <3> Condensing of Claisen. <4> Perkin reaction. <5> Hofmann reaction.
[EX A]: 3

[EX Q]: Question: The oxidation of fatty acids in cells of higher plants takes place in: 
 Options:  <1> Endoplasmic reticulum. <2> Chloroplasts <3> Peroxisomes <4> Citosol <5> Mitochondria
[EX A]:
3