**Core Concept**
Tubercular osteomyelitis, also known as tuberculous osteomyelitis, is a type of bone infection caused by Mycobacterium tuberculosis. It is a rare but serious complication of tuberculosis, affecting the skeletal system.

**Why the Correct Answer is Right**
Tubercular osteomyelitis typically involves the metaphysis of long bones, such as the femur, tibia, and humerus. The infection spreads from the bone marrow to the cortex, leading to bone destruction and abscess formation. The pathogenesis involves the hematogenous spread of M. tuberculosis from a primary focus, such as the lungs, to the bone. The bacteria then infect the osteoblasts and osteoclasts, leading to bone resorption and destruction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because tubercular osteomyelitis can occur in any age group, including children and adults. The disease is not limited to a specific age range.
**Option B:** This option is incorrect because tubercular osteomyelitis can present with a wide range of symptoms, including pain, swelling, and fever. The disease is not always asymptomatic.
**Option C:** This option is incorrect because tubercular osteomyelitis can affect any bone, including the vertebrae, pelvis, and long bones. The disease is not limited to a specific bone or region.

**Clinical Pearl / High-Yield Fact**
Tubercular osteomyelitis is often associated with a high risk of complications, including bone deformity, joint destruction, and systemic spread of the infection. Early diagnosis and treatment are crucial to prevent these complications and improve outcomes.

**Correct Answer:** A.