A child is born with a single functional copy of a tumor suppressor gene. At the age of 5 years, the remaining normal allele is lost through mutation. As a result, the ability to control the transition from G1 to the S phase of the cell cycle is lost. Which of the following neoplasms is most likely to arise by means of this mechanism -: (A) Retinoblastoma, (B) Breast carcinoma, (C) Adenocarcinoma of colon, (D) Cerebral astrocytoma
Answer is A. None