This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Subject name: Pediatrics
[{'content': 'What is the following device used to measure? \nSelect and explain. \nA. Ovarian size, B. Size of a Tumor, C. Size of Fecolith, D. Testicular size', 'role': 'user'}, {'content': "Answer: D \nExplanation: Orchidometer-used to measure testicular size - Stretch the scrotal skin and measure testicular size with orchidometer. - Testicular enlargement first sign of pubey in boys For the assessment of pubey -Tanner's staging or SMR (Sexual Maturity rating) Pubey in females :1st sign - Thelarche (development of breast buds)", 'role': 'assistant'}]