Answer
one-largest
Work Step by Step
If angle $A$ is obtuse ($>90^\circ$), then $B+C <90$ and both of them must be acute.
$$a^2 = b^2+c^2-2bc \cos{A}$$
$$ \because \cos{A} \text{ is negative in } QII\\ \therefore a \text{ is the largest side} $$