Question

question 57 (1 point)
all of the following are known carcinogens except
a) nickel.
b) tobacco.
c) oncogenes.
d) ionizing radiation.

Explanation:

• Nickel: Classified as a carcinogen, especially in certain occupational exposures.
• Tobacco: Well - known carcinogen due to its harmful chemicals like nicotine and tar.
• Oncogenes: These are genes (not external substances like carcinogens). They can contribute to cancer development when mutated but are part of the body's genetic material, not an external carcinogenic agent.
• Ionizing radiation: A recognized carcinogen as it can damage DNA.

Answer:

C. oncogenes