This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Orthopaedics
[{'content': 'Which of the following is not an aggressive periosteal reaction? \nSelect and explain. \nA. Spiculated, B. Laminated, C. Thick and irregular, D. Interrupted', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Thick and irregular Periosteal reaction* Periosteum is dense layer of specialized connective tissue which invests the outer bony cortex except at the articulating surfaces of synovial joints.* Direct or indirect insult to the periosteum causes it to elevate from the underlying bony cortex. This causes a nonspecific radiological finding called periosteal reaction. Following table depicts the different types of periosteal reactions.Types of periosteal reactionNon-aggressiveThin Solid Thick and irregular SeptatedAggressiveSpiculated Hair-on-end Sunburst Laminated Disorganised Interrupted Codman triangle", 'role': 'assistant'}]