Question

Match List-I with List-II: 

List-I (Infectious agents)	List-II (Associated disease)
(A) Mycobacteria	(I) Indian tick typhus
(B) Prions	(II) Thrush
(C) Rickettsia	(III) Mad cow disease
(D) Yeast	(IV) Leprosy

Choose the correct answer from the options given below:

• (A) - (IV), (B) - (III), (C) - (I), (D) - (II)
• (A) - (II), (B) - (I), (C) - (III), (D) - (IV)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Prions are unique proteinaceous infectious particles always associated with spongiform encephalopathies such as BSE/Mad cow disease (B-III). Connecting this first helps rule out most incorrect options.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
This matching question evaluates the broad classification of pathogens (bacteria, prions, rickettsia, and fungi/yeasts) and their associated clinical diseases.

Step 2: Detailed Explanation:
Let us match each infectious agent with its corresponding disease:
- Mycobacteria (A): Members of the genus Mycobacterium are acid-fast bacteria. Mycobacterium leprae is the causative agent of human leprosy, and Mycobacterium lepraemurium causes feline leprosy. This matches with (IV).
- Prions (B): Prions are abnormal, transmissible pathogenic agents composed solely of misfolded proteins. They cause transmissible spongiform encephalopathies (TSEs), including Bovine Spongiform Encephalopathy (BSE), commonly known as Mad cow disease. This matches with (III).
- Rickettsia (C): These are obligate intracellular Gram-negative bacteria. Rickettsia conorii is the causative agent of Indian tick typhus, which is transmitted by ixodid ticks. This matches with (I).
- Yeast (D): Candida albicans is a dimorphic yeast that causes candidiasis, commonly referred to as Thrush in the oral cavity or digestive tract of birds and mammals. This matches with (II).
Combining these individual linkages, the matching sequence is (A) - (IV), (B) - (III), (C) - (I), (D) - (II).

Step 3: Final Answer:
The matching sequence is represented by option (A).