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
UMN lesion is characterised by : 
Select and explain. 
A. Weakness & spasticity, B. Fasciculations, C. Rigidity, D. Localised muscle atrophy
A: Weakness & spasticity
Answer: A: Weakness & spasticity 
Explanation: Answer is A (Weakness and Spasticity): Spasticity is a characteristic of U.M.N. lesion. Fasciculations, hypotonia and muscle atrophy are features of LMN, not UMN palsy UMN LMN Power :Decreased 1. Power :Very much decreased Weakness; Q (Muscle groups or Limbs being affected & Weakness (severe) due to paralysis of individual muscles. not individual muscles Q) Tone: Flaccidity (Hypotonia) Q 2. Tone : Hypeonia = Clasp knife spasticityQ 3. Wasting/Atrophy is marked (cardinal feature) Q Wasting /Atrophy :Minimal, if present and due to 4. Reflexes disuse atrophy. Reflexes Superficial reflexes :Lost Superficial Reflexes :Lost Q Deep reflexes :Exaggerated Q Deep reflexes :Brisk/Exaggerated 2 Clonus :Absent Q Clonus :May be + nt Q Plantar :Flexor or no response Q Plantar :Extensor Q 5. Fasciculations :Present Q Fasciculations :Absent 6. Reaction of degeneration in muscles :Present Q Reaction of degeneration in muscles :absent