This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
A sesamoid bone is present in the tendon of which of the following muscles? 
Select and explain. 
A. Flexor hallucis longus., B. Extensor hallucis brevis., C. Adductor hallucis, D. Flexor hallucis brevis
D: Flexor hallucis brevis
Answer: D: Flexor hallucis brevis 
Explanation: Sesamoids are found in locations where a tendon passes over a joint, such as the hand, knee, and foot. In the foot, the first metatarsal bone usually has two sesamoid bones at its connection to the big toe (both within the tendon of flexor hallucis brevis).In the knee - The patella (within the quadriceps tendon). In the hand - Two sesamoid bones are commonly found in the distal poions of the first metacarpal bone (within the tendons of adductor pollicis and flexor pollicis brevis). In the wrist - The pisiform of the wrist is a sesamoid bone (within the tendon of flexor carpi ulnaris).