Task: Question Answering
Input (English): Question: I remember during the school days , the teacher asked the class "can you tell me the sum of the first 50 odd numbers ?".
I ran quickly to the teacher and told her "the answer is 2500". The teacher replied "lucky guess".
She then asked me "can you tell me the sum of first 71 odd numbers ?".
I wait for approx 10 seconds and replied with the correct answer.
How can i answer so quickly and whats the correct answer ?

 Option A: 8715

 Option B: 0152

 Option C: 3581

 Option D: 5041

 Option E: 9126
Output (English): Option D