This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Following are thyrotoxicosis signs EXCEPT - \nSelect and explain. \nA. Infrequent blinking, B. Inability to converge the eyeballs, C. Visible upper scleara on looking straight, D. Stridor on gently pressing lobes of thyroid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In hypehyroidism, lagging of the upper eyelid as the eye looks downward, impairment of convergence, and retraction of the upper eyelid and infrequent blinking may be present. Page 1910, Nelson textbook of pediatrics 19th edition', 'role': 'assistant'}]