In this one word substitution question, select the term that means “delusion of suffering from a disease”.

Introduction / Context:
This vocabulary question tests knowledge of medical or psychological one word substitutions that end with “mania”. Such words usually refer to abnormal obsessions or delusions. The phrase in the question is “delusion of suffering from a disease”, which points to an unreasonable and persistent belief of being ill even without real medical evidence.

Given Data / Assumptions:

• The description is about a delusion related to disease.
• All options end with “mania”, meaning an abnormal obsession or mental condition.
• The prefixes differ: “Lype”, “Noso”, “Naruo”, and “Phago”.
• We must choose the word that clearly connects to disease.

Concept / Approach:
In such technical vocabulary, Greek or Latin roots help identify the meaning. The root “noso” or “nos” refers to disease, as seen in words like “nosology” (study of diseases). Therefore, “nosomania” refers to an obsession or delusion about disease. The other prefixes relate to different ideas: “lype” is linked with sorrow, and “phago” is linked with eating. So, the correct word must be “Nosomania”.

Step-by-Step Solution:
Step 1: Focus on the key idea: the delusion of suffering from a disease. Step 2: Recall that “noso” is a root that means disease. Step 3: Connect “noso” with “mania”. The resulting word “Nosomania” refers to an abnormal obsession with disease. Step 4: Compare with other options: “Lypemania” relates to extreme sadness, “Phagomania” to obsession with eating, and “Naruomania” does not correspond to any standard known root linked to disease. Step 5: Conclude that Option B is the only term that logically and etymologically matches the definition.

Verification / Alternative check:
You can cross check the meaning of “Nosomania” in a medical or psychological dictionary. It will be defined as a morbid obsession with disease or a delusion that one is constantly ill. This meaning fits exactly with the phrase given in the question. None of the other options match this idea when checked against reliable sources.

Why Other Options Are Wrong:
Option A: “Lypemania” is related to excessive sadness or melancholy and is not directly connected with fear of illness. Option C: “Naruomania” does not have a recognised meaning in standard English medical vocabulary. Option D: “Phagomania” describes an abnormal craving for eating or food, not a delusion about disease.

Common Pitfalls:
Students sometimes choose answers by guessing from the sound of the word without understanding the roots. Learning basic Greek and Latin roots such as “noso” for disease, “cardio” for heart, and “phago” for eating can greatly improve accuracy in such questions. Also, remember that “mania” on its own only indicates obsession; the root before it decides the specific type of obsession.

Final Answer:
The correct one word substitution for “delusion of suffering from a disease” is Nosomania.