Discussion
A condition of human hair that causes the appearance of bonding along the hair shaft due to the presence of numerous small irregular air spaces situated at intervals in the cortex is :
Answer: A
The condition is pili annulati.
Pili annulati (ringed hair) shows alternating light and dark bands along the shaft. The light bands are caused by clusters of small, irregular air-filled spaces in the cortex, which scatter light; under transmitted light they look dark. The paper's 'bonding' refers to this banding.
Monilethrix gives beaded hair with periodic narrowings, trichorrhexis invaginata gives 'bamboo hair', where the shaft telescopes into itself, and trichonodosis is knotting of the hair. None involves bands of cortical air spaces.
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