This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Which of the following statements about fibromyalgia is true: \nSelect and explain. \nA. More common in males, B. Sleep EEG studies have shown disruption in REM sleep, C. Increased coisol response to stress, D. SPECT studies have reduced blood flow to the thalamus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Pathogenetic features in fibromyalgia:Disruption of normal stage IV NREM sleepLow levels of serotonin metabolites in CSFReduced levels of growth hormoneIncreased levels of neurotransmitter substance P in CSFDecreased coisol response to stress and coicotrophin-releasing hormoneAutonomic dysfunctionReduced blood flow to the thalamus, caudate nucleus, and tectum on SPECTPsychiatric disturbances(ref:Harrison's 18/e p2849-2851, 17/e p2180)", 'role': 'assistant'}]