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: Biochemistry
UV light causes mutation in cells by 
Select and explain. 
A. Formation of pyrimidine dimers, B. Ionisation of molecules, C. Double stranded DNA break, D. Chromosomal instability
A: Formation of pyrimidine dimers
Answer: A: Formation of pyrimidine dimers 
Explanation: None