Question

multiple choice question
when stem cells are injected directly into the brains of parkinson’s sufferers, they take root and stimulate ______ production.

serotonin
oxtocin
dopamine
endorphin

Explanation:

Parkinson's disease is associated with a deficiency of dopamine in the brain. Stem cell therapy for Parkinson's aims to stimulate dopamine production as dopamine - producing neurons are affected in Parkinson's. Serotonin is related to mood, appetite etc., oxytocin is associated with social bonding and childbirth, and endorphins are related to pain relief and pleasure. So the correct option is dopamine.

Answer:

C. dopamine (assuming the options are labeled A, B, C, D with A: serotonin, B: oxytocin, C: dopamine, D: endorphin)