Which of the following countries has a flag featuring a yellow lion wielding a sword on a dark red background?

The answer is Sri Lanka. The flag of Sri Lanka features a prominent yellow lion holding a sword on a dark red background. This lion represents bravery and strength, reflecting the country's historical background and its commitment to defend freedom and sovereignty. The dark red background symbolizes the nation's perseverance and determination. Overall, the flag of Sri Lanka is a unique representation of the country's values and heritage.