Select the INCORRECTLY spelt word.

Correct option is A

The misspelled word is "Thyriod" which should be spelled as "Thyroid".
 Meanings of the words given:
 Thyroid: This refers to the endocrine gland located in the neck that produces hormones that regulate metabolism.
 Disaster: This refers to a sudden event, such as an accident or natural catastrophe, that causes great damage or loss of life.
 System: This refers to a set of connected things or parts that work together to achieve a particular result or function.
 Distance: This refers to the amount of space between two points or objects, either in physical space or in terms of time, effort, or difference.