This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Golgi tendon is innervated by which nerve fibre? 
Select and explain. 
A. Ia, B. Ib, C. II, D. III
B: Ib
Answer: B: Ib 
Explanation: Ans. B IbGOLGI TENDON ORGAN is embedded within the musculotendinous junction (90%) and in the tendon itself (10%).* They are stimulated by: Increased tension at muscle tendon* Afferent: Ib fiber (myelinated).* Mediates inverse stretch reflexExtra MileReflexAfferent fiberStimulusResponseGolgi tendon reflexIbMuscle contractionRelaxation of the muscleStretch reflexIaMuscle is stretchedContraction of the muscleFlexor - withdrawal reflexII, III, and IVPain, touchIpsilateral flexion, contralateral extension* Group III/IV afferent fibers are afferent arm of cardiovascular ventilatory reflex responses which are mediated in nucleus tractus solitarius and ventrolateral medulla. They facilitate central fatigue and are important in endurance sports.