Concept:
The concept of “Panchakosha” (five sheaths) is an important doctrine in Vedantic philosophy. It explains that the human being is composed of five layers or coverings surrounding the true Self (Ātman).
The detailed explanation of Panchakosha is given in the Taittiriya Upanishad. According to this teaching, spiritual realization is attained by transcending these five sheaths.
Step 1: Understand the meaning of Panchakosha.
The word “Panchakosha” means:
\[
\text{Pancha} = \text{Five}, \qquad \text{Kosha} = \text{Sheath or covering}
\]
The five Koshas are:
• Annamaya Kosha (Physical sheath)
• Pranamaya Kosha (Vital energy sheath)
• Manomaya Kosha (Mental sheath)
• Vijnanamaya Kosha (Intellectual sheath)
• Anandamaya Kosha (Bliss sheath)
Step 2: Identify the text where Panchakosha is described.
The doctrine of Panchakosha is systematically explained in:
\[
\text{Taittiriya Upanishad}
\]
This Upanishad explains the progressive refinement from the gross physical body to the blissful spiritual state.
Step 3: Analyze the given options.
Option (A): Yogasutra
The Yoga Sutras mainly discuss the philosophy and practice of Yoga but do not provide the Panchakosha doctrine.
Option (B): Gherandasamhita
This text focuses primarily on Hatha Yoga practices and purification methods.
Option (C): Taittriyopnishada
This is the correct text where the Panchakosha doctrine is explained in detail.
Option (D): Shrimad Bhagvad Gita
The Bhagavad Gita discusses Yoga and spiritual philosophy but not the formal Panchakosha classification.
Step 4: Identify the correct option.
Since the concept of Panchakosha is found in the Taittiriya Upanishad, the correct answer is:
\[
\boxed{\text{Taittriyopnishada}}
\]