One reason to require medical practitioners to be liscensed is that ...?

a) medical care is so expensive
b) medical care is a public good
c) buyers of medical care lack perfect information
d) medical care involves substantial externalities.

cant be A or B... can be C or D. but i think it's D.

c) buyers of medical care lack perfect information

You and I don't know much about medicine and disease, but we trust a doctor because we see his certifications on the wall.
I would say D

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