**Core Concept**
Hepatitis A virus (HAV) is a non-enveloped, positive-sense RNA virus belonging to the picornavirus family. It primarily causes acute hepatitis, but rare cases of fulminant hepatitis and chronic infection have been reported.

**Why the Correct Answer is Right**
HAV is transmitted through the fecal-oral route, typically via contaminated food, water, or close contact with an infected individual. The virus enters the liver via the bloodstream, where it replicates and causes inflammation, leading to elevated liver enzymes and clinical manifestations of hepatitis. The immune system typically clears the virus within 2-3 months, but in rare cases, HAV can lead to chronic infection, particularly in individuals with underlying liver disease.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because HAV is not transmitted through the blood, unlike hepatitis B and C viruses.
**Option B:** This option is incorrect because HAV is not a DNA virus; it is a positive-sense RNA virus.
**Option C:** This option is incorrect because HAV does not cause chronic infection in the majority of cases; it is typically cleared within 2-3 months.

**Clinical Pearl / High-Yield Fact**
HAV vaccination is recommended for individuals traveling to endemic areas, particularly those with pre-existing liver disease or immunocompromised states. The vaccine provides long-term immunity against HAV infection and is also effective in preventing secondary transmission.

**Correct Answer: D**