## **Core Concept**
The patient presents with painless gross hematuria, which is a symptom that warrants immediate investigation due to its association with urinary tract malignancies, especially in a 60-year-old smoker. Smoking is a significant risk factor for bladder and renal cancers. The primary goal is to identify the cause of hematuria, which could range from benign to malignant conditions.

## **Why the Correct Answer is Right**
The correct answer, **C. CT Urogram**, is the most logical initial investigation for several reasons:
- **Comprehensive Imaging**: CT Urogram provides detailed images of the kidneys, ureters, and bladder, making it an excellent tool for detecting tumors, stones, and other abnormalities.
- **Non-invasive**: It's a non-invasive procedure, which is advantageous for initial assessment.
- **Quick and Detailed**: It can quickly provide detailed information that can guide further management, including the need for cystoscopy or biopsy.

## **Why Each Wrong Option is Incorrect**
- **Option A: Ultrasound**: While ultrasound is a useful initial tool for assessing the kidneys and bladder, it may not provide the detailed information about the ureters and the extent of potential lesions that a CT Urogram offers.
- **Option B: X-ray KUB**: This provides limited information and is less sensitive for detecting causes of hematuria compared to CT Urogram. It's more commonly used for detecting kidney stones.
- **Option D: Cystoscopy**: Although cystoscopy is crucial for evaluating the bladder mucosa and is indicated for hematuria, especially in smokers, it is more invasive and typically follows imaging studies that assess the upper urinary tract.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that painless gross hematuria in a smoker warrants a high index of suspicion for malignancy. The American Urological Association recommends that patients with gross hematuria undergo evaluation that includes imaging (CT Urogram or MRI Urogram) and cystoscopy.

## **Correct Answer:** **C. CT Urogram**