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'.

Q: Question: The most appropriate microscopy to identify Treponema pallidum in exudates from syphilitic lesions is: 
 Options:  <1> Clear field without staining. <2> Clear field with simple staining. <3> Dark field <4> Phase contrast. <5> Polarized light

A: 3
****
Q: Question: One of the following types of transport through membranes does NOT exist: 
 Options:  <1> Ion transport facilitated by ionophore (against electrochemical gradient). <2> Facilitated diffusion (in favor of electrochemical gradient) <3> Primary active transport (against electrochemical gradient). <4> Ionic channel (in favor of electrochemical gradient). <5> Simple diffusion (in favor of concentration gradient).

A: 1
****
Q: Question: The treatment of 1-hexyne with 1 mole of hydrogen bromide results in: 
 Options:  <1> 1-bromo-1-hexene. <2> 1-bromo-2-hexene. <3> 1-bromo-3-hexene. <4> 2-bromo-1-hexene. <5> 2-bromo-2-hexene.

A:
4
****