He is being treated for his somnolence.

A. weakness

B. severe pain in the joints

C. intoxication

D. sleepiness

Answer: Option D

Solution(By Examveda Team)

Weakness : the state or condition of being weak.
Severe : (of something bad or undesirable) very great; intense.
Intoxication : the state of being intoxicated, especially by alcohol.
Sleepiness : the state of being sleepy.
Somnolence : is a state of strong desire for sleep, or sleeping for unusually long periods

Synonym of Somnolence is Sleepiness