Okay, let's tackle this question about when X-rays were discovered by Roentgen. The user provided the question with options A to D, but the options are missing. Hmm, that's a bit tricky. But the correct answer is supposed to be a specific year. I remember that Wilhelm Roentgen discovered X-rays in 1895. Let me confirm that.

First, I need to structure the explanation according to the user's guidelines. The core concept here is the historical context of medical imaging. The key point is the year 1895, which is when Roentgen made his discovery.

For the correct answer section, I'll explain that Roentgen's discovery was a pivotal moment in medical history, leading to the first X-ray image. I should mention the date, November 8, 1895, and the first X-ray image he took of his wife's hand.

Now, the incorrect options. Since the options aren't given, I'll assume common distractors. For example, if an option says 1890, that's too early. 1896 might be a year after, possibly when others started using X-rays. 1901 could be a red herring. Each incorrect option needs a brief explanation of why it's wrong.

The clinical pearl should highlight the significance of 1895 in the history of radiology. Maybe mention that Roentgen won the first Nobel Prize in Physics for this discovery. That's a high-yield fact for exams.

I need to keep each section concise, within the character limit. Let me check the formatting: bold the section titles, use bullet points where appropriate, and ensure no markdown except bold. Also, avoid repeating the question. Make sure the correct answer line is at the end with the correct letter and answer text. Since the options are missing, I'll just state the year as the correct answer text.

**Core Concept**
The discovery of X-rays by Wilhelm Conrad Roentgen in 1895 marked a foundational milestone in diagnostic imaging. This event revolutionized medicine by enabling non-invasive visualization of internal body structures.

**Why the Correct Answer is Right**
Wilhelm Roentgen discovered X-rays on November 8, 1895, during experiments with cathode-ray tubes. He observed that a fluorescent screen glowed when exposed to invisible rays, which he termed "X-rays" (unknown rays). The first radiographic image—a hand X-ray of his wife’s—was produced in December 1895, confirming the potential of X-rays for medical diagnostics. This discovery earned him the first Nobel Prize in Physics in 1901.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect if it refers to 1890—pre-dates Roentgen’s discovery by 5 years.
**Option B:** Incorrect if it refers to 1896—post-dates the discovery; this year saw widespread adoption but not the original discovery.
**Option C:** Incorrect if it refers to 1900—overestimates the timeline; Roentgen’s work preceded this by 5 years.
**Option D:** Incorrect if it refers to 1901—confuses the Nobel Prize year with the discovery date.

**Clinical Pearl / High-Y

✓ Correct Answer: C. 1895