Right answer is (a) 45 cm
For explanation: Road signs in the Republic of India are similar to those used in some parts of the United Kingdom, except that they are multilingual.
Most urban roads and state highways have signs in the state language and English. National highways have signs in the Hindi and English.
In 2012, the Tourism department of Kerala announced plans to upgrade road signs in the state to include maps of nearby hospitals. The Noida Authority announced plans to replace older signboards with new fluorescent signage.