This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen: Miscellaneous, Subject name: Anatomy
[{'content': 'All are true about Diploic veins EXCEPT: \nSelect and explain. \nA. Lined by single layer endothelium suppoed by elastic tissue, B. Present in Cranial bones, C. Valveless, D. Develop by 8th week of IUL', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diploic veins sta developing in the cranial bones at about 2 years of age and are fully developed at the age of 35 years. These are lined by a single layer endothelium suppoed by elastic tissue and are valveless.', 'role': 'assistant'}]