This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology Techniques, Subject name: Biochemistry
[{'content': 'DNA fingerprinting is based on possessing in DNA of: \nSelect and explain. \nA. Constant tandem repeat, B. Variable number tandem repeat, C. Non-repetitive sequence, D. Exon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Variable number tandem repeatDNA Finger printingThe use of normal genetic variation in the DNA (SNP or VNTR or RFLP) to establish a unique pattern of DNA fragments for an individual.This is also called DNA Profiling.Most commonly used is VNTR or repeat length polymorphism.The process of DNA finger printing was invented by Alec Jeffreys in 1985.Primer is needed', 'role': 'assistant'}]