Instructions: In this task, you will be presented with a multiple-choice question in Persian, and you should answer the question based on your knowledge. Classify the answers based on options.
Input: کدام کشور همسایه، کمترین مرز را با ایران دارد؟ <sep> (A) ترکیه (B) آذربایجان (C) ترکمنستان (D) ارمنستان
Output:
D