human
Question: How many people are estimated to be living with HIV/AIDS worldwide?
A: Below 20 million
B: 20-30 million
C: 30-40 million
D: 40-50 million
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
Yes

--- Answer ---
grounded