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'.

Input: Consider Input: Question: In the path that leads in the liver to acetoacetate biosynthesis from acetyl CoA, which of the following substances is the immediate precursor of acetoacetate? 
 Options:  <1> 3-Hydroxybutyrate <2> Acetoacetyl CoA. <3> 3-Hydroxybutyrate CoA. <4> Mevalonic acid. <5> 3-Hydroxy-3-methylglutaryl. CoA.

Output: 5


Input: Consider Input: Question: Enzymatic regulation by phosphorylation: 
 Options:  <1> It is reversible. <2> It requires enzymes that directly introduce the Pi. <3> Introduce the Pi into acidic and basic amino acids. <4> Always activate enzymes. <5> It is carried out by phosphatases.

Output: 1


Input: Consider Input: Question: Indicate the correct units of a zero order rate constant: 
 Options:  <1> mg-1. <2> h-1. <3> mg / h. <4> g X h / mL. <5> mL / h.


Output: 3