Analysis of a patient's lung tumor reveals that all of the malignant cells in this tumor have a specific chromosomal abnormality involving a fusion event between two sets of chromosomes. This MOST likely suggests that
a) This mutation was inherited.
b) The tumor is polyclonal.
c) The tumor is monoclonal in origin.
d) A large number of normal cells simultaneously underwent this mutation.
Answer: c) The tumor is monoclonal in origin.
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