Multiple Choice asks students to pick one option. True or False is the same block with the two options already filled in, which is why its chip reads Multiple Choice.
Adding one
Click into the page where you want it, type /, and pick from the menu. Typing after the slash filters the list.
Choose Multiple Choice, or True or False for the ready-made pair.
Write the question, type your options, and mark the correct one. Set the marks in the chip on the block.
Changing which option is correct after students have answered flags their work for re-marking.