**Core Concept**
Fungi are eukaryotic organisms that belong to the kingdom Fungi. They are heterotrophic, meaning they obtain their nutrients by decomposing organic matter or forming symbiotic relationships with other organisms.

**Why the Correct Answer is Right**
This question requires identifying the statement that is not true about fungi. To answer this question correctly, one must have a basic understanding of fungi and their characteristics. Fungi are eukaryotic organisms that obtain their nutrients by decomposing organic matter or forming symbiotic relationships with other organisms. They have cell walls made of chitin, and their metabolic processes are distinct from those of animals and plants.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because fungi are indeed eukaryotic organisms. They have a complex cell structure with a true nucleus, mitochondria, and other organelles.
* **Option B:** This option is incorrect because fungi are heterotrophic, meaning they obtain their nutrients by decomposing organic matter or forming symbiotic relationships with other organisms. They do not produce their own food through photosynthesis like plants.
* **Option C:** This option is incorrect because fungi do not have chloroplasts. Chloroplasts are organelles found in plant cells where photosynthesis takes place.

**Clinical Pearl / High-Yield Fact**
One important fact to remember is that fungi can cause a range of diseases in humans, from superficial skin infections to life-threatening systemic infections. Fungal infections can be challenging to diagnose and treat, and require a high index of suspicion in patients with unexplained symptoms or immunocompromised states.

**Correct Answer: D. Fungi have chloroplasts.**