**Core Concept**
The question is testing the understanding of the principles of infectious disease control, specifically the concept that isolation is not always effective in controlling the spread of certain diseases. This is due to the highly contagious nature of these diseases, which can be spread through various routes other than direct contact, such as airborne transmission.

**Why the Correct Answer is Right**
The correct answer is related to diseases that are highly contagious and can spread through the air, such as measles and tuberculosis. These diseases can be spread through respiratory droplets that are released when an infected person coughs or sneezes, and can infect others even if they are not in close contact with the infected person. The pathophysiology of these diseases involves the release of infectious particles into the air, which can be inhaled by others, leading to infection.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because some diseases that are spread through contact, such as HIV, can be controlled to some extent by isolation, although it is not always 100% effective.
* **Option B:** This option is incorrect because diseases that are spread through vectors, such as mosquitoes, can be controlled through vector control measures, such as eliminating standing water and using insecticides.
* **Option C:** This option is incorrect because diseases that are spread through contaminated food and water can be controlled through proper handling and treatment of food and water.

**Clinical Pearl / High-Yield Fact**
It's worth noting that isolation is most effective for diseases that are spread through direct contact, such as MRSA and norovirus. In these cases, proper hand hygiene and use of personal protective equipment can help prevent the spread of the disease.

**Correct Answer: D.**