Which of the following statements is correct?

• A
  "Bt" in "Bt cotton" indicates that it is a genetically modified organism produced through biotechnology.
• B
  Somatic hybridization involves the fusion of two complete plant cells containing desired genes.
• C
  The anticoagulant hirudin is produced from the seeds of transgenic $Brassica \, napus$.
• D
  The 'Flavr Savr' variety of tomato produces more ethylene, which improves its taste.