Which of the following is a water-borne disease? MCQ with Answer and Explanation

Explanation:
Plague is a severe zoonotic bacterial disease caused by Yersinia pestis. It is primarily transmitted to humans through the bite of infected rat fleas, most commonly Xenopsylla cheopis. The disease has three main forms: bubonic (swollen lymph nodes), pneumonic (lungs), and septicemic (blood). Tuberculosis is airborne, leprosy is transmitted via prolonged close contact, and tetanus enters through deep wounds.

Explanation:
The Miller-Urey experiment (1953) simulated the conditions of the primitive Earth's atmosphere (methane, ammonia, hydrogen, and water vapor) in a closed system and applied electrical sparks to simulate lightning. After a week, they found that several organic compounds, including amino acids (the building blocks of proteins), had been synthesized, supporting the theory of chemical evolution.

Explanation:
CCK, released from the duodenum in response to fats, stimulates contraction of the gall bladder and release of bile, and also stimulates pancreatic enzyme secretion. Gastrin stimulates HCl, secretin bicarbonate, motilin GI motility.