Who is the exponent of the theory of "economic drain" of India during the British rule:

A) Dadabhai Naoroji

B) M. N. Roy

C) Jai Prakash Narayan

D) Ram Monohar Lohia

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2002 (GS Paper I)