This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Lesions and Stridor, Subject name: ENT
Parosmia is: 
Select and explain. 
A. Perversion of smell sensation, B. Absolute loss of smell sensation, C. Decreased smell sensation, D. Perception of bad smell
A: Perversion of smell sensation
Answer: A: Perversion of smell sensation 
Explanation: (a) Perversion of smell sensation(Ref. Cummings, 6th ed., 639)Parosmia is perversion of smell sensation. Here good smell appears bad to the patient.Absolute loss of smell sensation is called anosmia.Decreased smell sensation is called hyposmia. Normal age related decline in smell sensation is presbyosmia.Phantosmia is the perception of a smell in the absence of any physical odours. The odour can range from pleasant to disgusting smells.Cacosmia or an unpleasant phantosmia is the perception of a bad smell without an odorant stimulus.