<prompt> Best marker for Electro Convulsive Therapy:CSF 5 HIAACSF serotoninBrain derived growth factorCSF dopamine  <response>: Ans.C. i.e. Brain-derived growth factorECT increases the levels of Brain-Derived Neurotrophic Factor and this mediates the response to ECT in drug-resistant depressed patients.Mechanism of action:- The ability of the brain to form and reorganize synaptic connections, especially in response to learning or experience or following injury.- Increases levels of Brain-Derived Growth Factor and Vascular Endothelial Growth Factor 