Assume that the PIC18F is currently executing a 16-bit instruction addressed by 0x00015A. What are the current contents of the program counter

0x00015C

Explanation:

Given that the counter is executing a 16-bit instruction ( currently )  

addressed as  0x00015A

The counter keeps/records the address of the next executable instruction hence the current contents of the program counter

= 0x00015A + 16 bits         note: ( 16 bits = 2 bytes )

hence current content of program counter  = 0x00015C

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posting this in wrong category will result in people seeing it who won't know the answer.