<prompt> The muscle of hand that contains a sesamoid bone isFlexor pollicis brevisFlexor pollicis longusOpponens pollicisAdductor pollicis  <response>: The tendon of inseion of adductor pollicis on the medial side of base of proximal phalanx of thumb contains a sesamoid bone.Reference: Textbook of anatomy, Upper limb, and thorax, Vishram Singh, 2nd edition, page no.144 