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Omg literally the same thought process I had, that phrase through me off!
because raising the arm above the shoulder suggests abduction which would mean the axillary nerve is also involved. the lesion would be more proximal.
I thought "up to the shoulder" is done by deltoid muscle (aka axillary nerve) and above is done by trapezius.
as far as i can find, abduction ranges of motion, per first aid are:
0-15° = supraspinatus
15-90° = Deltoid
90° = trapezius
100° (over the head) = serratus anterior
in this question, they are directly telling you its not the serratus (long thoracic), because no option compromises it. Also, trapezius is innervated by cranial nerve XI, which is not a part of the brachial plexus, so, even though its worded weirdly, you can assume they are talking about deltoid disfunction.
so deltoid disfunction (axillary) + radial disfunction = posterior cord
If only one person is there to see the doctor, why would the doctor prescribe medicine even for his family members who are not there?
Unfortunately, both of these are pretty contagious conditions. FA mentions that scabies spreads via skin to skin contact, and goes on to mention that you're supposed to treat close contacts. I think in this scenario it's ok to give permethrin to the family members who are not present but affected (it's also non-prescription in some cases, I believe.) Slightly related note, similar to why you would treat the sexual partner of someone with chlamydia/gonorrhea, or close contacts of someone with n. meningitides infection.