This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Pisiform is which type of bone 
Select and explain. 
A. Pneumatic bone, B. Sesamoid bone, C. Accessory bone, D. Long bone
B: Sesamoid bone
Answer: B: Sesamoid bone 
Explanation: Pisiform is pea shaped and has only one oval facet on the proximal pa of its dorsal surface. Pisiform aiculates only with Triquetral . Its Ossification stas at 12 years of age . It is situated where the ulna joins the wrist, within the tendon of the flexor carpi ulnaris muscle. B D Chaurasia 7th edition Page no : 27,28,29