The part of sequence of RNA coding for a protein and it's mutated sequence is given below.

Normal sequence : AGC- GCC- GAA- AGA- AAG- AUG- ACG
Mutated sequence : AGC- GCC- GAA- UGA- AAG- AUG- ACG

Type of mutation shown above is: (A) Missense mutation, (B) Nonsense mutation, (C) Silent mutation, (D) Frame shift mutation
Answer is B. AGA is mutated to UGA (Adenine is replaced by Uracil) Coding region is converted to Stop Codon. So it is a Nonsense point mutation.