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: Ophthalmological ointments: 
 Options:  <1> They may contain solid particles but only with a controlled size. <2> They do not need to be sterile. <3> They require the test of pyrogens. <4> They can not be W / O emulsions. <5> Always your excipients must be fatty
1

Question: In the activation of the serum complement, the assembly of the Membrane Attack Complex begins with: 
 Options:  <1> C9 <2> C5b. <3> C3a. <4> C6 <5> C8.
2

Question: Increase the activity of Na + / K + -ATPase: 
 Options:  <1> Insulin. <2> Aldosterone <3> ACTH. <4> Atrial natriuretic peptide. <5> ADH.

2