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
Radial bursa is the synol sheath covering the tendon of 
Select and explain. 
A. Flexor digitorum superficialis, B. Flexor digitorum profundus, C. Flexor Pollicis Longus, D. Flexor carpi radialis
C: Flexor Pollicis Longus
Answer: C: Flexor Pollicis Longus 
Explanation: The radial Bursa is a collection of synol fluid around the Tendon of the Flexor Pollicis Longus muscle, the primary flexor of the thumb ulnar bursa is a synol sheath in the carpal tunnel of the human hand. It contains tendons of the flexor digitorum an and the flexor digitorum profundus