The causative agents for gas gangrene and tetanus are:

a. facultative anaerobes

b. obligate aerobes

c. aerotolerent

d. obligate anaerobes

Obligate anaerobes (Ans. D)

Explanation:

Gas gangrene is a bacterial infection which produces tissue gas in gangrene. This is caused by bacteria Clostridium perfringens. Clostridium perfringens is a gram-positive, obligate anaerobic bacterium of the Clostridium genus. It is found in environmental sources & commonly found in raw meat and poultry.

Tetanus is a bacterial disease infected by Clostridium tetani, is an obligate anaerobic spore-forming bacteria. It is found in soil, dust and intestinal tracts of animals. Transmission of tetanus is commonly by contaminated wounds.