Given below is a diagrammatic cross section of a single loop of human cochlea
Which one of the following options correctly represents the names of three different parts?

• Correct answer
  A

  A : Perilymph, B : Tectorial membrane, C : Endolymph
• B

  B : Tectorial membrane, C : Perilymph, D : Secretory cells
• C

  C : Endolymph, D : Sensory hair cells, A : Serum
• D

  D : Sensory hair cells, A : Endolymph, B : Tectorial membrane

Hence, the correct answer is option: 'A'.