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
Afferent fibres for stretch reflex includes 
Select and explain. 
A. Ia and Ib  fibres, B. Ia  and II fibres, C. Ib  and II fibres, D. Golgi tendon organ
B: Ia  and II fibres
Answer: B: Ia  and II fibres 
Explanation: None