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: Physiology
Central wrapping is done by: 
Select and explain. 
A. Golgi tendon, B. Type 2 fibre, C. Flower spray ending, D. Annulospiral ending
D: Annulospiral ending
Answer: D: Annulospiral ending 
Explanation: Primary sensory nerve fiber belongs to type Iα (Aα) nerve fiber. Each sensory (afferent) nerve fiber has two branches. One of the branches supplies the central portion of nuclear bag  fiber. The other branch ends in central portion of the nuclear chain fiber. These branches end in the form of rings around central portion of nuclear bag and nuclear chain fibers.
Therefore, these nerve endings are called annulospiral endings.