challenge: What are some of the advantages of BODIPY that make it an effective marker?
  
  A. Low photodegradation, low toxicity, and high biocompatibility
  B. Low charge neutrality, low optoelectronic properties, and high ionic interactions
  C. High photodegradation, high toxicity, and low biocompatibility
  D. High polarity, low fluorescence quantum yield, and charge positivity
  Answer: 