Answer :
Final answer:
When medical science cannot determine the cause of a disease, it is referred to as 'Idiopathic'. The term reflects an unknown etiology or origin of the disease. However, it's a distinct entity itself rather than a disease caused by certain factors like hospital-acquired infections (Nosocomial), continuous deterioration in cells (Degenerative), or one resulted through medical treatment (Iatrogenic).
Explanation:
When medical science describes a disease as 'etiology unknown', the disease is referred to as Idiopathic. Essentially, this means that the cause of the disease is unknown or has not been determined. The term Idiopathic is derived from Greek words 'idios' meaning 'own' and 'pathos' meaning 'suffering'. Hence, a disease termed as idiopathic is a distinct disease entity in itself, which arises spontaneously or for which the cause remains uncertain.
On the other hand, Nosocomial relates to a disease or infection that was acquired in a hospital. Degenerative refers to diseases characterized by continuous deterioration and loss of function in the cells and tissues. Iatrogenic describes a condition that is caused by medical examinations or treatment. Therefore, in the context of the question asked, the correct answer is option C) Idiopathic.
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