challenge: What is the predicted function of TB9Cs6H1 snoRNA in relation to LSU5 ribosomal RNA (rRNA) and 5.8S?
  
  A. To transcribe LSU5 rRNA at residue 199 and 5.8S at residue 29
  B. To guide the methylation of LSU5 rRNA at residue 199 and 5.8S at residue 29
  C. To cleave LSU5 rRNA at residue 199 and 5.8S at residue 29
  D. To guide the pseudouridylation of LSU5 rRNA at residue 199 and 5.8S at residue 29
  Answer: 