Earliest tumour to appear after birth is-
**Core Concept**
The question is testing the knowledge of the timeline of tumor development in infants, specifically the earliest tumor to appear after birth. This concept is related to pediatric oncology and the embryological development of various tissues.
**Why the Correct Answer is Right**
The correct answer is a type of tumor that originates from the neuroblasts, which are the precursor cells of the nervous system. These cells are present in the neural tube, which forms during embryonic development. The earliest tumor to appear after birth is a medulloblastoma, which is a primitive neuroectodermal tumor (PNET) that arises from the cerebellum. Medulloblastomas are highly aggressive and have a high propensity for metastasis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a type of tumor that typically arises in adults, particularly in the middle-aged population, and is not the earliest tumor to appear after birth.
**Option B:** This option is incorrect because it is a type of tumor that typically arises in the gastrointestinal tract and is not the earliest tumor to appear after birth.
**Option C:** This option is incorrect because it is a type of tumor that typically arises in the skin and is not the earliest tumor to appear after birth.
**Clinical Pearl / High-Yield Fact**
Medulloblastomas are highly radiosensitive, and radiation therapy is a crucial component of treatment. However, the primary treatment modality is surgical resection, followed by chemotherapy and radiation therapy.
**Correct Answer: C. Medulloblastoma**