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': 'What is the instrument used for? \nSelect and explain. \nA. Assessment of eye size, B. Stool assessment tool, C. Assess the volume of testicles, D. Growth assessment tool', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The above image represents Orchidometer.\nIt helps to assess the volume of testicules.\nTesticular size > 4cc in volume is the 1st sign of puberty in males.', 'role': 'assistant'}]