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

Which of the following definitions best describes 'MLL3/4 complex'?

A. A protein complex that can methylate lysine-4 of histone H3, and which contains either of the protein subunits MLL3 or MLL4 in mammals, or equivalent in other species.
B. An cullin-dependent E3 ubiquitin ligase/histone H3-K9 methyltransferase complex essential for heterochromatin assembly by RNAi.
C. A conserved protein complex that catalyzes methylation of histone H3. In Saccharomyces the complex contains Shg1p, Sdc1p, Swd1p, Swd2p, Swd3p, Spp1p, Bre2p, and the trithorax-related Set1p; in mammals it contains the catalytic subunit (SETD1A or SETD1B), WDR5, WDR82, RBBP5, ASH2L/ASH2, CXXC1/CFP1, HCFC1 and DPY30.
D. A protein complex that contains eight subunits in common with the SWI/SNF complex, plus the ATPase BRG1 (SMARCA4) and the histone methyltransferase CARM1; the complex is involved in regulating nuclear receptor-dependent transcription.

Answer: A protein complex that can methylate lysine-4 of histone H3, and which contains either of the protein subunits MLL3 or MLL4 in mammals, or equivalent in other species.