Coloured urine is not seen in:
All the drugs mentioned above are associated with coloured urine. Though quinine may cause dark colored urine, its relatively rare compared to the other drugs given in the option. So quinine is the single best answer of choice by exclusion. Ref: Textbook of Medical Laboratory Technology By Sood, Page 36; Harrison's Principles of Internal Medicine, 16th Edition, Page 1229
Quinine
Rifampcin
Nitrofurantoin
Pyridium