World health day -: (A) 7th April, (B) 7th July, (C) 7th Dec, (D) 7th Feb
Answer is A. The constitution came into force on 7 th April 1948 which is celebrated every year as "world health Day ".A world health day theme is chosen each year to focus attention on a specific aspect of public health (refer pgno:919 park 23rd edition)