This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Higher Functions, Subject name: Physiology
The decerebrate rigidity is characterised by all of the following EXCEPT 
Select and explain. 
A. Rigidity occurs in all muscles of the body, B. There is increased 'g' motor neuron discharge, C. Increased excitability of the motor neuron pool, D. Removal of cerebellum reduces the rigidity
A: Rigidity occurs in all muscles of the body
Answer: A: Rigidity occurs in all muscles of the body 
Explanation: Decerebrate rigidity results from a section between the superior and inferior colliculus When a mid collicular section is made (coex removed), coical inhibitory influences on these areas are removed. Thus, there intrinsic firing is unchecked now, leading to excess facilitation of gamma motor neuron discharge and excessive activity of stretch reflexes. The resulting rigidity, called decerebrate rigidity, is mostly seen in the extensor or postural muscle groups. The rigidity in extensors causes a posture of arching backward - opisthotonus position.