Identify the incorrect statement/s :(A) Intestinal perforation and de…

The correct answer is Option (3) → (D) only

(A) Intestinal perforation and death may occur in severe cases of typhoid infection. True. Typhoid is caused by Salmonella typhi, which enters the small intestine and then spreads to other organs through the blood. In severe cases it can perforate the intestine and cause death.

(B) Common cold is caused by Rhinoviruses. True. Rhinoviruses infect the nose and the respiratory passage, but not the lungs.

(C) Lips and fingernails may turn grey to bluish colour in severe cases of pneumonia. True. The fluid-filled alveoli cannot take in enough oxygen, and the blood shows it in the lips and nails.

(D) Pneumonia is caused by Salmonella. False. Pneumonia is caused by other bacteria. Salmonella typhi causes typhoid, which infects the intestine, not the lungs.

(E) Typhoid fever could be confirmed by Widal test. True. The Widal test is the test used to confirm typhoid.

NCERT Extract:
Common Diseases in Humans – “… Bacteria like Streptococcus pneumoniae and Haemophilus influenzae are responsible for the disease pneumonia in humans which infects the alveoli (air filled sacs) of the lungs. As a result of the infection, the alveoli get filled with fluid leading to severe problems in respiration. The symptoms of pneumonia include fever, chills, cough and headache. In severe cases, the lips and finger nails may turn gray to bluish in colour.”