**Core Concept**
Cholangiography T-tube is a diagnostic imaging technique used to visualize the bile ducts after cholecystectomy. It involves injecting a contrast agent through a T-tube placed in the common bile duct to detect any residual stones, strictures, or other abnormalities.

**Why the Correct Answer is Right**
The correct timing for performing a T-tube cholangiography is crucial to avoid complications. Typically, a T-tube cholangiography is done 7-10 days after cholecystectomy. This allows time for the bile ducts to recover from the surgical trauma and reduces the risk of bleeding or infection. The procedure is usually performed under fluoroscopic guidance, and the contrast agent helps to visualize the bile ducts and detect any potential issues.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is too early for T-tube cholangiography, as the bile ducts may still be inflamed and sensitive to the procedure.
* **Option B:** This option is too late, as the risk of complications such as bile duct stricture or stone formation increases with time.
* **Option C:** This option is incorrect as it does not provide a specific time frame, and T-tube cholangiography requires a more precise timing to be effective.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the timing of T-tube cholangiography may vary depending on the surgeon's preference and the patient's individual factors. However, a general rule of thumb is to wait at least 7-10 days after cholecystectomy to perform this procedure.

**Correct Answer: C. 10 days.**