After Finishing a Class in Psychopharmacology,you Decide This Is Going

After finishing a class in psychopharmacology,you decide this is going to be your profession.Later you are asked,if you could take a time machine back in time,where would you travel to.Your answer would be to the century when the roots of your chosen profession began.Which century is it?

A) 17^th century
B) 18^th century
C) 19^th century
D) 20^th century