**Core Concept**
The iceberg phenomenon refers to the fact that a large proportion of cases of a particular disease or condition remain undiagnosed or asymptomatic, while only a small proportion present with overt symptoms. This is often due to the chronic nature of the disease or the presence of underlying risk factors.

**Why the Correct Answer is Right**
The correct answer is the option that does not exhibit the characteristic of having a large number of asymptomatic cases. The iceberg phenomenon is commonly observed in conditions such as hypertension, diabetes mellitus, and hyperlipidemia, where a significant proportion of individuals are unaware of their condition and do not seek medical attention.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely to show the iceberg phenomenon, as many cases of this condition are asymptomatic and only come to light when complications arise.
**Option B:** This condition is also likely to exhibit the iceberg phenomenon, as many individuals may be unaware of their condition and only seek medical attention when symptoms become severe.
**Option C:** This option is the correct answer, as it does not typically exhibit the characteristic of having a large number of asymptomatic cases.

**Clinical Pearl / High-Yield Fact**
The iceberg phenomenon highlights the importance of screening and early detection in preventing complications and improving outcomes in chronic diseases.

**Correct Answer:** C. This option does not typically show the iceberg phenomenon.