The answer is B) NMDA. NMDA is the third main type of glutamate receptor. It is clinically important as it is where medications like glutamate and amantadine work and also the site of action for drugs like PCP. The GABA-A and GABA-B receptors are inhibitory and the site of action for medications benzodiazepines (GABA-A) and Liorsel (GABA-B)

Publication reference : NMDA receptor encephalitis and other antibody-mediated disorders of the synapse: The 2016 Cotzias Lecture.
Reference URL: https://www.ncbi.nlm.nih.gov/pubmed/27920282