Task: Class Relation Understanding (ontology: Sciences/Biology)

Which of the following classes is one valid superclass of 'meiotic recombination initiation complex'?

A. 3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring) activity
B. nuclear protein-containing complex
C. 10-formyltetrahydrofolate biosynthetic process
D. 3-hydroxyanthranilate 3,4-dioxygenase activity

Answer: nuclear protein-containing complex