Explanation:

- Option 1: Bronchi

- The bronchi are part of the respiratory system. They are tubes that carry air into the lungs. They are not visible outside the body.

- Option 2: Thyroid cartilage

- The thyroid cartilage is a part of the larynx (voice box) and supports the voice box. It forms a prominent area in the throat.

- Option 3: Trachea

- The trachea, or windpipe, connects the larynx to the bronchi. It is not the visible protrusion in the throat.

- Option 4: Adam’s apple

- The Adam's apple is the visible, protruding part of a boy’s throat as the voice box grows. It is more prominent in males due to the larger thyroid cartilage.

Correct Answer: Option 4 - Adam’s apple

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