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

Question

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.

Answer 1

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.

Answer 2

I would say D