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': 'Laron dwarfism is caused by ? \nSelect and explain. \nA. Deficiency of GH, B. GH receptor defect, C. Deficiency of thyroxin, D. Thyroxin receptor defect', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., GH receptor defect Laron syndrome Dwarf Development of end organ resistance to growth hormone.", 'role': 'assistant'}]