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: The determination of cyanide by the Liebig method is based on the addition of a silver nitrate standard solution: 
 Options:  <1> Until complete precipitation of silver cyanide. <2> Until the precipitation of silver cyanide begins. <3> Until the appearance of a red precipitate of silver chromate. <4> Until the AgCN complex is quantitatively formed. <5> Until the precipitation of silver iodide, yellow.

Output: 2


Input: Consider Input: Question: COMPLETE: in the Krebs cycle 4 oxidation reactions occur, in 3 of them the final acceptor electron is ___ and in the other is ___: 
 Options:  <1> FAD / FMN. <2> NAD + / FMN. <3> NADP + / FAD. <4> NAD + / FAD. <5> FAD / NAD +.

Output: 4


Input: Consider Input: Question: Statins are used to reduce cholesterol levels and act as analogs of the transition state of an enzyme involved in its biosynthesis. What enzyme is it? 
 Options:  <1> 14-Alpha-demethylase. <2> Hydroxymethylglutaryl coenzyme A (HMGCoA) reductase. <3> Cyclooxygenase 2 (COX-2). <4> Squalene epoxidase. <5> Aromatase


Output: 2