Question about DevAcademy Quiz

Completing the nRF Connect SDK Fundamentals in the DevAcademy, I stumbled across this question:

Why is true not a valid answer here? Running gpio_pin_set_dt(&led, true); is valid and in Lesson 2 exercise 1 you literally do it as well with bools:

/* STEP 6.1 - Read the status of the button and store it */
bool val = gpio_pin_get_dt(&button);

/* STEP 6.2 - Update the LED to the status of the button */
gpio_pin_set_dt(&led, val);

Is this an error or a nitpick, because true is written with a capital t, which does't work in C (which I would argue that in a title/button you can/should capitalize words) or am I missing something?

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