Concept: This question tests your knowledge of the anatomy of the human ear, specifically identifying the coiled structure within the inner ear.

Why (A) is correct: The inner ear, also known as the labyrinth, consists of two main parts: the bony labyrinth and the membranous labyrinth. The cochlea is the snail-shaped, coiled portion of the bony labyrinth that houses the organ of Corti, which is responsible for hearing.

Why other options are wrong:

• (B) eardrum: The eardrum (tympanic membrane) is part of the middle ear, separating it from the outer ear.
• (C) pinna: The pinna (auricle) is the visible, external part of the ear, made of cartilage.
• (D) ear canal: The ear canal (external auditory meatus) is part of the outer ear, leading from the pinna to the eardrum.

Common Mistake: Students sometimes confuse the parts of the outer, middle, and inner ear. Remember that the cochlea is specifically an inner ear structure.

NEET Tip / Mnemonic: Think of 'Cochlea' as 'Coiled' – both start with 'Co' and describe its shape.

Correct Answer: (A)