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Q.  A flock of sheep has been grazing on Sorghum halepense (Johnson grass), Tetradymia spp. (horsebrush) and Artemisia nova (black sage). Many of the exposed animals have edema, especially in their heads. This lamb has edema around the eyes and the ears show hyperkeratinized tissue. What is the photosensitizing agent responsible for this condition?
  1. Tetradymia spp.
  2. Chlorophyll
  3. Phylloerythrin
  4. Artemisia nova
  5. Bile acids