The correct option is Shikhara.
Explanation
Indian temple architecture is primarily classified into the Nagara style (North India) and the Dravida style (South India). The terminology for the vertical structures rising above the main sanctum (Garbhagriha) differs distinctly between these two traditions.Analysis of Options
- Shikhara (Correct): In North Indian (Nagara) temples, the curvilinear, mountain-like spire rising directly above the sanctum sanctorum is called the Shikhara. The term literally translates to "mountain peak."
- Vimana (Incorrect): This is the corresponding term in South Indian (Dravida) architecture. The Vimana is the tower above the sanctum, but unlike the curvilinear Shikhara, it is typically pyramidal and stepped in shape.
- Gopuram (Incorrect): This refers to the monumental entrance gateway in Dravida style temples. In later South Indian architecture, Gopurams often became taller and more ornate than the main shrine's tower.
- Jagamohana (Incorrect): This term is specific to the Odisha School of Nagara architecture. It refers to the assembly hall or mandapa located in front of the sanctum, not the main spire.
Key Takeaway
The vertical tower over the main shrine is known as a Shikhara (curvilinear) in North Indian temples and a Vimana (pyramidal) in South Indian temples.