Pectic ulcers cause acidity-related pain and bleeding in the stomach and duodenum of affected persons. What is the cause of this disease ? Who gave this finding ?

(a) Name the disease that causes acidity-related pain and bleeing in the stomach and duodenum of affected humans. (b) Who recently proved that this disease does not occur because of lifestyle reasons but is caused by a bacterium. (c) Name the causative bacterium of this disease.

Assertion : Peptic ulcers cause acidity related pain and bleeding in the stomach. Reason : Stress in the life causes peptic ulcers.

How does a healthy person acquire pneumonia? What are the causative organisms of the disease? State the symptoms of pneumonia.

Anjali and her friends went on an educational trip to the Kangra district in Himanchal Pradesh. They observed that many people had swollen necks. Help Anjali and her friends to find out the answers to the following questions: What is the cause of this disease?