In the following question a certain relation exists between the first two words. The same relation also exists between the third and the fourth word. Out of these four words one word is missing and is denoted by a question mark in the question. Find out the missing word from the words given below.
Ornithologist : Bird :: Anthropologist : ?

Mankind

The missing word is Mankind.

The relationship between Ornithologist and Bird is that an Ornithologist is a scientist who studies birds. Similarly, an Anthropologist is a scientist who studies mankind.

The other options are not correct because:

• Animals is too general a term. An Ornithologist is not a scientist who studies all animals.
• Insects are a type of animal, but an Ornithologist does not specifically study insects.
• Minerals are not living things, so an Ornithologist does not study them.