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The mollusc nervous system is referred to as a tetraneural nervous system, because there are four main neural strands: Two pairs of connectives link the cerebral ganglia to the pedal ganglia on the ventral side. Another to the visceral ganglia and parietal ganglia passing the pleural ganglia on the dorsal side. See the diagram in the link. Therefore A. Cco: Cerebral commissure. C. Pdco: Pedal commissure Cco: B. Left Cerebral pedal commissure. D. Left pedal Visceral commissure