You are answering a USMLE-style medical question. Question: An unidentified surgical specimen is received for histopathologic analysis. A portion of the specimen is cut and stained with hematoxylin and eosin. The remainder is analyzed and is found to contains type II collagen and chondroitin sulfate. Which of the following structures is most likely the origin of this surgical specimen? Options: A) Blood vessel B) Pinna C) Lens D) Larynx Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.