This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Which is not a side effect of lamotrigine 
Select and explain. 
A. Diplopia, B. Dizziness, C. Decreased cognition, D. Rash
C: Decreased cognition
Answer: C: Decreased cognition 
Explanation: (C) Decreased cognition # Side effectsare sleepiness, dizziness, diplopia, ataxia and vomiting.> In some comparative trials lamotrigine has been found to be better tolerated than carbamazepine or phenytoin.> Negative effect on cognitive function is not reported.> Rash may be a severe reaction requiring withdrawal.