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'.

Question: Turbidimetry and nephelometry are non-spectroscopic techniques based on the dispersion of light, with interesting applications in biochemical analysis. The criteria to be taken into account when choosing between nephelometry and turbidimetry in the analysis of a sample containing particles in suspension are: 
 Options:  <1> The size of the suspended particles and the detector of the instrument. <2> The size of the suspended particles and the wavelength of the radiation used. <3> The wavelength of the radiation emitted and the shape of the suspended particles. <4> The size of the suspended particles and the color of them. <5> The color of the particles and their fluorescence.
2

Question: What dose should you administer orally every 12 hours of a drug whose plasma clearance is equal to 1 L / h if you want to reach an average concentration of 10mg / L equilibrium? Assume complete bioavailability (F = 1): 
 Options:  <1> 120 mg. <2> 12 mg. <3> 200 mg. <4> 10 mg. <5> With this information it is not possible to estimate the dose necessary to reach this equilibrium concentration.
1

Question: The antitussive dextromethorphan is an enantiomer of the O-methylated derivative of levorphanol that belongs to the structural family of: 
 Options:  <1> 6,7-Benzomorpanos. <2> Morfinanos. <3> 4-Phenylpiperidines. <4> Phenylpropalamine. <5> Oripavinas.

2