change border color of touchableopacity in React Native

i want to do a quiz screen so i have 2 TouchableOpacity like this. I want when the Answer1 is pressed, the bordercolor will change to blue and the Anwer2 will not. I use setState and onPress like this. But when I press Answer1, both TouchableOpacity change bordercolor to blue. How can i fix this?enter image description here

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