challenge: Who wrote the monograph 'Indian Trees: An Account of Trees, Shrubs, Woody Climbers, Bamboos, and Palms Indigenous or Commonly Cultivated in the British Indian Empire'?
  
  A. Alexander von Humboldt
  B. Sir Dietrich Brandis
  C. Archibald Constable
  D. Johann Wolfgang von Goethe
  Answer: 