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: Medicine
Features of Gegenhalten are all exept 
Select and explain. 
A. It is voluntary opposition by patient to passive movement of limb, B. It is stiffening of limb in response to contact, C. Strength of antagonists remains the same as examiner uses increased force to change limb position, D. It is present throughout the range of motion
C: Strength of antagonists remains the same as examiner uses increased force to change limb position
Answer: C: Strength of antagonists remains the same as examiner uses increased force to change limb position 
Explanation: Answer- C. Strength of antagonists remains the same as examiner uses increased force to change limb positionIt is ako called paratonia or paratonic rigidity.It is the voluntary opposition of patient to passive movement of limb.It is the movement of the limb to counteract any movement made by the examiner.The resistance offered to passive movement is variable and fluctuating in nature.Patient is unable to relax a group of muscles on command due to inattentiveness.Strength of antagonists increases as examiner uses increasing force to change the limb position.Resistance is present throughout the range of motion.It is also described as stifening of limb in response to contact.It is a sign of bilateral frontal lobe dysfunction" especially mesial coex and superior convexity