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
Regarding golgi tendon organ true is? 
Select and explain. 
A. Senses dynamic length of muscle, B. Involved in reciprocal innervations, C. a-motor neuron stimulation, D. Sense muscle tension
D: Sense muscle tension
Answer: D: Sense muscle tension 
Explanation: None