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': "A baby on examination shows unilateral Moro's reflex with positive palmar grasp reflex. The site of lesion is – \nSelect and explain. \nA. C3–C4, B. C5–C6, C. C8–T1, D. C1–C2", 'role': 'user'}, {'content': "Answer: B \nExplanation: Moro's reflex is a neonatal reflex which develops by 28th wk of gestation and disappears by 3-6 months of age.\nMoro reflex is obtained by placing the infant in a semi-upright position. then the head is momentarily allowed to fall backwards with immediate re-support by the examiner's hand.\nThe child symmetrically abducts and extends the arms and flexes the thumbs, followed by flexion and adduction of upper extremities.\n\nUnilateral Moro's reflex is seen in :\n\nErb's palsy (C5-C6) damage \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nSpastic hemiplegia\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nFracture of humerus or clavicle.\xa0\nShoulder dislocation \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nExaggerated Moro's reflex is seen in - cerebral damage.", 'role': 'assistant'}]