Question

which of the following statements regarding lung cancer is false?
lung cancer is the second most commonly diagnosed cancer for men and women in the united states.
lung cancer is the leading cause of cancer death.
for most people, symptoms of lung cancer do not appear until the disease is advanced.
chest x - rays are recommended as a routine screening test for lung cancer.

when a tick transfers lyme disease from a deer to a human, the tick is considered the ______ in the chain of infectio
reservoir
vector
host
infectious agent

which of the following is not a type of skin cancer?
melanoma
squamous cell
sarcoma
basal cell

Explanation:

First Question (Lung Cancer False Statement)

To determine the false statement about lung cancer:

• Lung cancer is the second most common cancer (after breast/prostate) for men and women in the US, so that statement is true.
• Lung cancer is the leading cause of cancer death, which is true.
• Lung cancer symptoms often appear late (advanced disease), so that's true.
• Chest X - rays are not recommended for routine lung cancer screening (low - dose CT is recommended for high - risk groups). So the false statement is "Chest X - rays are recommended as a routine screening test for lung cancer."

In the chain of infection:

• A reservoir is where the infectious agent lives (e.g., deer for Lyme).
• A vector is an organism that transmits the infectious agent (tick transmits Lyme from deer to human).
• A host is the organism that gets infected (human here).
• The infectious agent is the pathogen (Lyme bacteria). So the tick is a vector.

• Melanoma, squamous cell carcinoma, and basal cell carcinoma are all types of skin cancer.
• Sarcoma is a type of cancer that arises from connective tissue (not skin epithelial tissue), so it's not a skin cancer.

Answer:

The statement "Chest X - rays are recommended as a routine screening test for lung cancer" is the false one.

Second Question (Tick in Chain of Infection)