Final answer:
Lentils are the only legume mentioned that does not need to be soaked before cooking.
Step-by-step explanation:
Of the legumes mentioned, lentils are the only ones that do not need to be soaked before cooking.
Soaking legumes before cooking helps to soften them and reduce cooking time. It also aids in removing some of the natural sugars that can cause gas and bloating. However, lentils are different because they have a thinner skin and cook relatively quickly, typically in about 20-30 minutes, without the need for soaking.
On the other hand, black beans, garbanzos, and pinto beans all benefit from soaking before cooking to help soften their texture and reduce cooking time.