This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Attention deficit hyperactivity disorder is seen in \nSelect and explain. \nA. Insulin resistance, B. Thyroid hormone resistance, C. Testosterone deficiency, D. Calmodulin Deficiency', 'role': 'user'}, {'content': "Answer: D \nExplanation: ADHD:\n\nAttention Deficit Hyperactivity Disorder.\nDifficulty in paying attention, difficulty in controlling behavior and hyperactivity.\nEtiology- both genetic and environmental factors. Abnormality in dopamine transporter and thyroid receptor beta genes in some patients.\n\nThree subtypes are known:\n\nPredominantly hyperactive-impulsive\nPredominantly inattentive\nCombined hyperactive-impulsive and inattentive.\n\nDiagnosis is primarily clinical, using thorough clinical interview of parents and use of behavior rating scales. Physical examination includes direct observation of the child and ruling\xa0out chronic systemic illnesses that affect child's attention span.", 'role': 'assistant'}]