In tandem bullet, the number of bullets fired is ?

**Core Concept**
The question is referring to the "tandem" or simultaneous firing of two bullets from a revolver, which is a critical concept in forensic ballistics and medical jurisprudence. The number of bullets fired is a crucial piece of information in determining the circumstances of a shooting.

**Why the Correct Answer is Right**
In a tandem firing, both chambers of the revolver are fired simultaneously, resulting in two bullets being discharged. This occurs when the trigger is pulled while the hammer is still cocked, causing the two chambers to fire in rapid succession. The mechanism of tandem firing is related to the design of the revolver's firing mechanism and the position of the trigger.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not applicable as there is no information provided to support a single bullet being fired.
* **Option B:** This option is incorrect as there is no other type of firing mechanism that would result in a single bullet being fired in tandem with another bullet.
* **Option C:** This option is incorrect as it is not a recognized term in forensic ballistics or medical jurisprudence.

**Clinical Pearl / High-Yield Fact**
It's essential to note that tandem firing can be difficult to distinguish from a single bullet wound, as the entry and exit wounds may appear similar. However, a thorough forensic examination, including analysis of the bullet trajectories and wound patterns, can help determine if tandem firing occurred.

**Correct Answer: 2. Two bullets are fired in tandem.**