This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
CTEV is caused by all except - 
Select and explain. 
A. Neurological disorder, B. Idiopathic, C. Spina fibida, D. Cubitus varus
D: Cubitus varus
Answer: D: Cubitus varus 
Explanation: Causes of CTEV

CTEV may be either primary or secondary

1) Primary or Idiopathic

It is the most common type of CTEV
Foot deformity (CTEV) is the only manifestation, otherwise, musculoskeletal system is normal.

2) Secondary

CTEV is a local manifestation of a systemic syndrome.
Causes are:-


Neurological disorders & neural tube defects eg myelomeningocele, & spinal dysraphism
Paralytic disorder (due to muscular imbalance) as polio, spina bifida, myelodysplasia, & Friedreich's ataxia
Arthrogryposis multiplex
Larsen syndrome
Freeman- Sheldon syndrome
Diastrophic dwarfism
Sacral agenesis, tibial deficiency, constriction rings & amniotic bands