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

Which of the following definitions best describes 'phospholipase C-activating G protein-coupled acetylcholine receptor signaling pathway'?

A. A phospholipase C-activating receptor G protein-coupled receptor signaling pathway that starts with an opsin being activated by a photon, and transmitting the signal through the Gq-mediated activation of phospholipase C (PLC). PLC hydrolyses phosphatidylinositol 4,5-bisphosphate (PIP2) into the second messengers inositol-1,4,5,-triphosphate (IP3) and diacylglycerol (DAG). The second messengers, including cGMP, activate channels that result in transmission of the light signal through the synapses. Typical examples are rhabdomeric photoreceptors in the eyes of protostomes.
B. A phospholipase C-activating receptor G protein-coupled receptor signaling pathway initiated by endothelin binding to its receptor on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription.
C. A phospholipase C-activating G protein-coupled receptor signaling pathway initiated by acetylcholine binding to its receptor on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription.
D. A phospholipase C-activating receptor G protein-coupled receptor signaling pathway initiated by dopamine binding to its receptor on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription.

Answer: A phospholipase C-activating G protein-coupled receptor signaling pathway initiated by acetylcholine binding to its receptor on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription.