What Can We Conclude from Experiments in Which Isolated Suprachiasmatic

What can we conclude from experiments in which isolated suprachiasmatic nucleus (SCN) tissue was maintained in a petri dish?

A) The SCN cannot maintain normal rhythmicity without input from the retinohypothalamic pathway.
B) The SCN cannot maintain normal rhythmicity without the influence of melatonin.
C) The SCN regulates other internal clocks,but requires their input in order to maintain normal rhythmicity.
D) The SCN can maintain normal rhythmicity without any input.

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