**Core Concept**
Yaws is a chronic infectious disease caused by *Treponema pallidum subspecies pertenue*, which primarily affects children in tropical regions. It is characterized by a skin lesion and can progress to more severe forms if left untreated.

**Why the Correct Answer is Right**
Yaws is transmitted through non-sexual contact with an infected individual, typically through skin-to-skin contact or via contaminated soil or fomites. The bacteria penetrate the skin through minor cuts or abrasions, and the disease can be treated with antibiotics such as azithromycin or penicillin.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because yaws is not transmitted through sexual contact, unlike syphilis.
**Option B:** Incorrect because the primary lesion of yaws is typically a painless ulcer, not a vesicle.
**Option C:** Incorrect because yaws can be transmitted through casual contact with an infected individual, not just through intimate contact.

**Clinical Pearl / High-Yield Fact**
It's essential to differentiate yaws from other tropical diseases such as leprosy and cutaneous anthrax, which can present with similar skin lesions.

**Correct Answer: None of the above. Yaws is a non-venereal disease.**