Question

5. The chemical carcinogen, aflatoxin B-1 derived form a fungus, which contaminates grain
foods most commonly induces:
a. Transitional cell carcinoma of lung.
b. Adenocarcinoma of rectum.
c. Squamous cell carcinoma of skin.
d. Hepatocellular carcinoma.
e. Renal cell carcinoma.
6. Which of the following is not a malignant tumor:
a. Glioma.
b. Leiomyoma.
c. Lymphoma.
d. Melanoma.
e. Medulloblastoma.

Answer 1

1. Correct answer is hepatocellular carcinoma.
• aflatoxin b1 causes cancer by producing genetic changes in target hepatocytes
• dietary exposure of aflatoxins is a major risk factor for HCC.
• it is more common in low income countries.

2. Correct answer is leiomyoma.
•glioma- malignant tumor of glial cells.
•leiomyoma- benign smooth muscle tissue tumor.
•lymphoma- cancer affecting lymphatic system.
•melanoma- skin cancer
•medulloblastoma- malignant brain tumor in children.