Which one of the following is an enzyme ?

Answer: Option B

Answer: Option A

Answer: Option C

Answer: Option C

Explanation:

Ecology - Study of interrelationship between living and their environment.

Dermatology - Study of Skin.

Demography - Study of population.

Answer: Option A

Explanation:

Mc. Collum invented Vitamin A, Vitamin B and Vitamin D

Holst invented Vitamin C

Ronald Ross invented Malaria parasite and treatment.