**Core Concept**
Cholera is an acute diarrheal illness caused by Vibrio cholerae, a Gram-negative bacterium. The disease is primarily spread through the fecal-oral route, often through contaminated water or food. Prompt treatment with antibiotics and fluid replacement is crucial to prevent severe dehydration and death.

**Why the Correct Answer is Right**
Option C is incorrect because the treatment of choice for cholera in adults is oral rehydration therapy (ORT) with fluids and electrolytes, not antibiotics. However, in severe cases or when the patient is severely dehydrated, doxycycline or ciprofloxacin may be used as empirical therapy. Azithromycin is not the preferred treatment for cholera.

**Why Each Wrong Option is Incorrect**
**Option A:** The incubation period of cholera typically ranges from 1-5 days, not 1-2 days. While the incubation period can vary, the correct range should be remembered for accurate diagnosis.
**Option B:** Rice-water diarrhea is indeed a characteristic symptom of cholera, caused by the large amounts of Vibrio cholerae toxin that lead to a profuse, watery diarrhea.
**Option D:** Cholera is indeed a notifiable disease, requiring prompt reporting to local, national, and international health authorities to prevent outbreaks and control transmission.

**Clinical Pearl / High-Yield Fact**
In areas with high cholera prevalence, oral rehydration therapy should be initiated promptly, and antibiotics should be reserved for severe cases or when the patient is severely dehydrated. Public health measures, such as improving sanitation, safe water supply, and hygiene practices, are essential to prevent the spread of cholera.

**✓ Correct Answer: C. Azithromycin is treatment of choice in adults**