Read the given statements and select the correct option.
(i)Synaptic cleft of neurons secreates adrenaline.
(ii)Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii)Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv)Spinal and cranial nerves are made of non-myelinated nerve fibres.

Options

A. a, b, c - correct, d - incorrect
B. c, d - correct, a, b - incorrect
C. a, b - correct, c, d - incorrect
D. b, c - correct, a, d - incorrect

Answer

D

Explanation

Synaptic cleft of neurons secrete acetylcholine.
Spinal cord and cranial nerves are made of myelinated nerve fibres.