What is the only muscle that can flex the distal phalanx of fingers two through five?

Question

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The flexor digitorum profundus is the only muscle that can flex the distal phalanx of fingers two through five. The flexor digitorum superficialis can only flex the middle phalanges of these fingers. The flexor digitorum longus is a muscle in the leg that flexes the toes. The flexor digitorum brevis is a muscle in the foot that flexes the toes.

What Is the Only Muscle That Can Flex the Distal